diff --git a/Cargo.lock b/Cargo.lock
index 1465837..5f3d28e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -394,6 +394,8 @@ dependencies = [
  "thiserror",
  "tokio",
  "toml 0.9.2",
+ "tracing",
+ "tracing-subscriber",
  "url",
 ]
 
@@ -746,6 +748,12 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "lazy_static"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bbd2bcb4c963f2ddae06a2efc7e9f3591312473c50c6685e1f298068316e66fe"
+
 [[package]]
 name = "libc"
 version = "0.2.174"
@@ -780,6 +788,15 @@ version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "112b39cec0b298b6c1999fee3e31427f74f676e4cb9879ed1a121b43661a4154"
 
+[[package]]
+name = "matchers"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8263075bb86c5a1b1427b5ae862e8889656f126e9f77c484496e8b47cf5c5558"
+dependencies = [
+ "regex-automata 0.1.10",
+]
+
 [[package]]
 name = "memchr"
 version = "2.7.5"
@@ -815,6 +832,16 @@ dependencies = [
  "windows-sys 0.59.0",
 ]
 
+[[package]]
+name = "nu-ansi-term"
+version = "0.46.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77a8165726e8236064dbb45459242600304b42a5ea24ee2948e18e023bf7ba84"
+dependencies = [
+ "overload",
+ "winapi",
+]
+
 [[package]]
 name = "object"
 version = "0.36.7"
@@ -836,6 +863,12 @@ version = "1.70.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a4895175b425cb1f87721b59f0f286c2092bd4af812243672510e1ac53e2e0ad"
 
+[[package]]
+name = "overload"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b15813163c1d831bf4a13c3610c05c0d03b39feb07f7e09fa234dac9b15aaf39"
+
 [[package]]
 name = "pear"
 version = "0.2.9"
@@ -1024,8 +1057,17 @@ checksum = "b544ef1b4eac5dc2db33ea63606ae9ffcfac26c1416a2806ae0bf5f56b201191"
 dependencies = [
  "aho-corasick",
  "memchr",
- "regex-automata",
- "regex-syntax",
+ "regex-automata 0.4.9",
+ "regex-syntax 0.8.5",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c230d73fb8d8c1b9c0b3135c5142a8acee3a0558fb8db5cf1cb65f8d7862132"
+dependencies = [
+ "regex-syntax 0.6.29",
 ]
 
 [[package]]
@@ -1036,9 +1078,15 @@ checksum = "809e8dc61f6de73b46c85f4c96486310fe304c434cfa43669d7b40f711150908"
 dependencies = [
  "aho-corasick",
  "memchr",
- "regex-syntax",
+ "regex-syntax 0.8.5",
 ]
 
+[[package]]
+name = "regex-syntax"
+version = "0.6.29"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f162c6dd7b008981e4d40210aca20b4bd0f9b60ca9271061b07f78537722f2e1"
+
 [[package]]
 name = "regex-syntax"
 version = "0.8.5"
@@ -1219,6 +1267,15 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "sharded-slab"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f40ca3c46823713e0d4209592e8d6e826aa57e928f09752619fc696c499637f6"
+dependencies = [
+ "lazy_static",
+]
+
 [[package]]
 name = "shlex"
 version = "1.3.0"
@@ -1326,6 +1383,15 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "thread_local"
+version = "1.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f60246a4944f24f6e018aa17cdeffb7818b76356965d03b07d6a9886e8962185"
+dependencies = [
+ "cfg-if",
+]
+
 [[package]]
 name = "tinystr"
 version = "0.8.1"
@@ -1535,9 +1601,21 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "784e0ac535deb450455cbfa28a6f0df145ea1bb7ae51b821cf5e7927fdcfbdd0"
 dependencies = [
  "pin-project-lite",
+ "tracing-attributes",
  "tracing-core",
 ]
 
+[[package]]
+name = "tracing-attributes"
+version = "0.1.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "81383ab64e72a7a8b8e13130c49e3dab29def6d0c7d76a03087b3cf71c5c6903"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "tracing-core"
 version = "0.1.34"
@@ -1545,6 +1623,36 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b9d12581f227e93f094d3af2ae690a574abb8a2b9b7a96e7cfe9647b2b617678"
 dependencies = [
  "once_cell",
+ "valuable",
+]
+
+[[package]]
+name = "tracing-log"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ee855f1f400bd0e5c02d150ae5de3840039a3f54b025156404e34c23c03f47c3"
+dependencies = [
+ "log",
+ "once_cell",
+ "tracing-core",
+]
+
+[[package]]
+name = "tracing-subscriber"
+version = "0.3.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e8189decb5ac0fa7bc8b96b7cb9b2701d60d48805aca84a238004d665fcc4008"
+dependencies = [
+ "matchers",
+ "nu-ansi-term",
+ "once_cell",
+ "regex",
+ "sharded-slab",
+ "smallvec",
+ "thread_local",
+ "tracing",
+ "tracing-core",
+ "tracing-log",
 ]
 
 [[package]]
@@ -1598,6 +1706,12 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "06abde3611657adf66d383f00b093d7faecc7fa57071cce2578660c9f1010821"
 
+[[package]]
+name = "valuable"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ba73ea9cf16a25df0c8caa16c51acb937d5712a8429db78a3ee29d5dcacd3a65"
+
 [[package]]
 name = "version_check"
 version = "0.9.5"
@@ -1728,6 +1842,28 @@ dependencies = [
  "rustls-pki-types",
 ]
 
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
 [[package]]
 name = "windows-sys"
 version = "0.52.0"
diff --git a/Cargo.toml b/Cargo.toml
index 10333c1..65f0224 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -23,3 +23,5 @@ figment = { version = "0.10", features = ["env", "toml"] }
 serde = { version = "1.0", features = ["derive"] }
 toml = "0.9"
 thiserror = "2.0"
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter", "fmt"] }
diff --git a/Config.toml.example b/Config.toml.example
index 1132f14..805ef00 100644
--- a/Config.toml.example
+++ b/Config.toml.example
@@ -6,3 +6,4 @@ timeout_sec = 20
 concurrency = 30
 proxy = "http://username:password@host:port"
 enable_multiplexing = true
+log_level = "info"
diff --git a/src/adapters/output/local.rs b/src/adapters/output/local.rs
index 937fa2d..8a26c48 100644
--- a/src/adapters/output/local.rs
+++ b/src/adapters/output/local.rs
@@ -3,6 +3,7 @@ use crate::error::Result;
 use std::{fs, io::Write};
 use tokio::io::{AsyncWriteExt, BufWriter};
 use toml::Value;
+use tracing::info;
 
 // Write valid key to output file
 pub async fn write_keys_txt_file(
@@ -31,6 +32,6 @@ pub fn write_keys_clewdr_format(file: &mut fs::File, key: &GeminiKey) -> Result<
 pub fn write_keys_to_file(keys: &[String], filename: &str) -> Result<()> {
     let content = keys.join("\n");
     fs::write(filename, content)?;
-    println!("File '{}' created with {} keys", filename, keys.len());
+    info!("File '{}' created with {} keys", filename, keys.len());
     Ok(())
 }
diff --git a/src/config/config.rs b/src/config/config.rs
index 88488d0..1d11f55 100644
--- a/src/config/config.rs
+++ b/src/config/config.rs
@@ -77,6 +77,9 @@ pub struct KeyCheckerConfig {
     // Whether to enable HTTP/2 multiplexing for requests.
     #[serde(default)]
     pub enable_multiplexing: bool,
+
+    #[serde(default)]
+    pub log_level: String,
 }
 
 impl Default for KeyCheckerConfig {
@@ -110,33 +113,36 @@ impl KeyCheckerConfig {
     /// Returns the complete Gemini API URL for generateContent endpoint
     pub fn gemini_api_url(&self) -> Url {
         self.api_host
-            .join("v1beta/models/gemini-2.0-flash-exp:generateContent")
+            .join("v1beta/models/gemini-2.5-flash-lite:generateContent")
             .expect("Failed to join API URL")
     }
 }
 
 impl Display for KeyCheckerConfig {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        writeln!(f, "API Host: {}", self.api_host)?;
-
         let proxy_status = match &self.proxy {
             Some(proxy) => proxy.to_string(),
             None => "Disabled".to_string(),
         };
-        writeln!(f, "Proxy: {}", proxy_status)?;
 
         let protocol_status = if self.enable_multiplexing {
             "HTTP/2 (Multiplexing Enabled)"
         } else {
             "HTTP/1.1 (Multiplexing Disabled)"
         };
-        writeln!(f, "Protocol: {}", protocol_status)?;
 
-        writeln!(f, "Timeout: {}s", self.timeout_sec)?;
-        writeln!(f, "Concurrency: {}", self.concurrency)?;
-        writeln!(f, "Input: {}", self.input_path.display())?;
-        writeln!(f, "Output: {}", self.output_path.display())?;
-        write!(f, "Backup: {}", self.backup_path.display())
+        write!(
+            f,
+            "Host={}, Proxy={}, Protocol={}, Timeout={}s, Concurrency={}, Input={}, Output={}, Backup={}",
+            self.api_host,
+            proxy_status,
+            protocol_status,
+            self.timeout_sec,
+            self.concurrency,
+            self.input_path.display(),
+            self.output_path.display(),
+            self.backup_path.display()
+        )
     }
 }
 
@@ -150,6 +156,7 @@ static DEFAULT_CONFIG: LazyLock<KeyCheckerConfig> = LazyLock::new(|| KeyCheckerC
     concurrency: 50,
     proxy: None,
     enable_multiplexing: true,
+    log_level: "info".to_string(),
 });
 
 // LazyLock for the test message body used in API key validation
diff --git a/src/error.rs b/src/error.rs
index 5919182..927cb88 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -5,9 +5,6 @@ pub enum ValidatorError {
     #[error("HTTP error: {0}")]
     ReqwestError(#[from] reqwest::Error),
 
-    #[error("Key is unavailable or invalid")]
-    KeyInvalid,
-
     #[error("IO error: {0}")]
     Io(#[from] std::io::Error),
 
@@ -26,8 +23,11 @@ pub enum ValidatorError {
     #[error("URL parse error: {0}")]
     UrlParse(#[from] url::ParseError),
 
-    #[error("Key validation failed: {0}")]
-    Validation(String),
+    #[error("Key is unavailable or invalid")]
+    KeyInvalid,
+
+    #[error("Invalid Google API key format: {0}")]
+    KeyFormatInvalid(String),
 }
 
 pub type Result<T> = std::result::Result<T, ValidatorError>;
diff --git a/src/main.rs b/src/main.rs
index bf7cb6b..372bc6f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,7 +1,7 @@
 use gemini_keychecker::error::ValidatorError;
 use gemini_keychecker::{BANNER, config::KeyCheckerConfig, service::start_validation};
-
 use mimalloc::MiMalloc;
+use tracing::info;
 
 #[global_allocator]
 static GLOBAL: MiMalloc = MiMalloc;
@@ -9,11 +9,19 @@ static GLOBAL: MiMalloc = MiMalloc;
 /// Main function - displays banner and starts validation service
 #[tokio::main]
 async fn main() -> Result<(), ValidatorError> {
+    let config = KeyCheckerConfig::load_config()?;
+    // Initialize tracing with professional format using configured log level
+    tracing_subscriber::fmt()
+        .with_target(false)
+        .with_level(true)
+        .with_env_filter(
+            tracing_subscriber::EnvFilter::try_from_default_env()
+                .unwrap_or_else(|_| tracing_subscriber::EnvFilter::new(&config.log_level)),
+        )
+        .init();
     // Display banner and configuration status at startup
     println!("{BANNER}");
-
-    let config = KeyCheckerConfig::load_config()?;
-    println!("{config}");
+    info!("Configuration loaded: {}", config);
 
     // Start validation service
     start_validation().await
diff --git a/src/service/key_tester.rs b/src/service/key_tester.rs
index 7bbc568..984c54b 100644
--- a/src/service/key_tester.rs
+++ b/src/service/key_tester.rs
@@ -1,6 +1,7 @@
 use backon::{ExponentialBuilder, Retryable};
 use reqwest::{Client, IntoUrl, StatusCode};
 use tokio::time::Duration;
+use tracing::{debug, error, info, warn};
 use url::Url;
 
 use crate::config::TEST_MESSAGE_BODY;
@@ -15,19 +16,23 @@ pub async fn validate_key(
     let api_endpoint = api_endpoint.into_url()?;
 
     match send_test_request(client, &api_endpoint, api_key.clone()).await {
-        Ok(response) => {
-            let status = response.status();
-            match status {
-                StatusCode::OK => Ok(api_key),
-                StatusCode::UNAUTHORIZED
-                | StatusCode::FORBIDDEN
-                | StatusCode::TOO_MANY_REQUESTS => Err(ValidatorError::KeyInvalid),
-                _ => Err(ValidatorError::ReqwestError(
-                    response.error_for_status().unwrap_err(),
-                )),
+        Ok(_) => {
+            info!("SUCCESS - {}... - Valid key found", &api_key.as_ref()[..10]);
+            Ok(api_key)
+        }
+        Err(e) => {
+            match e.status() {
+                Some(StatusCode::UNAUTHORIZED | StatusCode::FORBIDDEN | StatusCode::TOO_MANY_REQUESTS) => {
+                    warn!("INVALID - {}... - {}", &api_key.as_ref()[..10], ValidatorError::KeyInvalid);
+                    Err(ValidatorError::KeyInvalid)
+                }
+                _ => {
+                    let req_error = ValidatorError::ReqwestError(e);
+                    error!("ERROR-  {}... - {}", &api_key.as_ref()[..10], req_error);
+                    Err(req_error)
+                }
             }
         }
-        Err(e) => Err(ValidatorError::ReqwestError(e)),
     }
 }
 
@@ -49,7 +54,7 @@ async fn send_test_request(
             .json(&*TEST_MESSAGE_BODY)
             .send()
             .await?;
-
+        debug!("Response for key {}: {:?}", key.as_ref(), response.status());
         response.error_for_status()
     })
     .retry(&retry_policy)
diff --git a/src/service/validation.rs b/src/service/validation.rs
index c3b0073..7fb8132 100644
--- a/src/service/validation.rs
+++ b/src/service/validation.rs
@@ -59,7 +59,6 @@ impl ValidationService {
 
         // Process validated keys and write to output file
         while let Some(valid_key) = valid_keys_stream.next().await {
-            println!("Valid key found: {}", valid_key.as_ref());
             if let Err(e) = write_keys_txt_file(&mut buffer_writer, &valid_key).await {
                 eprintln!("Failed to write key to output file: {}", e);
             }
@@ -73,7 +72,7 @@ impl ValidationService {
     }
 }
 
-/// 启动验证服务 - 封装了所有启动逻辑
+
 pub async fn start_validation() -> Result<(), ValidatorError> {
     let config = KeyCheckerConfig::load_config()?;
 
diff --git a/src/types.rs b/src/types.rs
index ffb9f7d..e81cf4b 100644
--- a/src/types.rs
+++ b/src/types.rs
@@ -1,3 +1,4 @@
+use crate::error::ValidatorError;
 use regex::Regex;
 use std::str::FromStr;
 use std::sync::LazyLock;
@@ -14,9 +15,8 @@ impl AsRef<str> for GeminiKey {
 }
 
 impl FromStr for GeminiKey {
-    type Err = &'static str;
-
-    fn from_str(s: &str) -> Result<Self, Self::Err> {
+    type Err = ValidatorError;
+    fn from_str(s: &str) -> Result<Self, ValidatorError> {
         static RE: LazyLock<Regex> =
             LazyLock::new(|| Regex::new(r"^AIzaSy[A-Za-z0-9_-]{33}$").unwrap());
 
@@ -27,7 +27,7 @@ impl FromStr for GeminiKey {
                 inner: cleaned.to_string(),
             })
         } else {
-            Err("Invalid Google API key format")
+            Err(ValidatorError::KeyFormatInvalid(cleaned.to_string()))
         }
     }
 }