diff --git a/common/protocol_parser/src/lib.rs b/common/protocol_parser/src/lib.rs
index 6708d277bf..a9fe590758 100644
--- a/common/protocol_parser/src/lib.rs
+++ b/common/protocol_parser/src/lib.rs
@@ -119,7 +119,7 @@ fn next_measurement(buf: &str) -> Option<(&str, usize)> {
     let mut exists_measurement = false;
     let (mut tok_begin, mut tok_end) = (0, buf.len());
     let mut i = 0;
-    for (_, c) in buf.chars().enumerate() {
+    for c in buf.chars() {
         // Measurement begin character
         if c == '\\' {
             escaped = true;
@@ -161,7 +161,7 @@ fn next_metric(buf: &str) -> Option<(&str, usize)> {
     let mut exists_metric = false;
     let (mut tok_begin, mut tok_end) = (0, buf.len());
     let mut i = 0;
-    for (_, c) in buf.chars().enumerate() {
+    for c in buf.chars() {
         // Measurement begin character
         if c == '\\' {
             escaped = true;
@@ -210,7 +210,7 @@ fn next_tag_set(buf: &str) -> NextTagRes {
 
     let mut tag_set: Vec<(&str, &str)> = Vec::new();
     let mut i = 0;
-    for (_, c) in buf.chars().enumerate() {
+    for c in buf.chars() {
         // TagSet begin character
         if !escaped && c == '\\' {
             escaped = true;
@@ -294,7 +294,7 @@ fn next_field_set(buf: &str) -> Result<Option<(FieldSet, usize)>> {
 
     let mut field_set: FieldSet = Vec::new();
     let mut i = 0;
-    for (_, c) in buf.chars().enumerate() {
+    for c in buf.chars() {
         // TagSet begin character
         if c == '\\' {
             escaped = true;
diff --git a/main/src/http/http_service.rs b/main/src/http/http_service.rs
index 284444f8e2..fa07d0af02 100644
--- a/main/src/http/http_service.rs
+++ b/main/src/http/http_service.rs
@@ -668,7 +668,7 @@ impl HttpService {
                 info!("debug pprof: {:?}", res);
                 match res {
                     Ok(v) => Ok(v),
-                    Err(e) => Err(reject::custom(HttpError::PProfError { reason: e })),
+                    Err(e) => Err(reject::custom(HttpError::PProf { reason: e })),
                 }
             }
             #[cfg(not(unix))]
@@ -688,7 +688,7 @@ impl HttpService {
                 info!("debug jeprof: {:?}", res);
                 match res {
                     Ok(v) => Ok(v),
-                    Err(e) => Err(reject::custom(HttpError::PProfError { reason: e })),
+                    Err(e) => Err(reject::custom(HttpError::PProf { reason: e })),
                 }
             }
             #[cfg(not(unix))]
diff --git a/main/src/http/mod.rs b/main/src/http/mod.rs
index 0cb3cb6d22..4de14e0edd 100644
--- a/main/src/http/mod.rs
+++ b/main/src/http/mod.rs
@@ -70,7 +70,7 @@ pub enum Error {
 
     #[snafu(display("gerante pprof files: {}", reason))]
     #[error_code(code = 9)]
-    PProfError {
+    PProf {
         reason: String,
     },
 
diff --git a/main/src/server.rs b/main/src/server.rs
index 2da8efe635..034c532a20 100644
--- a/main/src/server.rs
+++ b/main/src/server.rs
@@ -37,10 +37,10 @@ pub enum Error {
     NotFoundDBMS { backtrace: Backtrace },
 
     #[snafu(display("Ensure the format of certificate and private_key is correct."))]
-    IdentityFormatError,
+    IdentityFormat,
 
     #[snafu(display("Ensure the TLS configuration is correct"))]
-    TLSConfigError,
+    TLSConfig,
 
     #[snafu(display("Server Common Error : {}", reason))]
     Common { reason: String },
@@ -48,13 +48,13 @@ pub enum Error {
 
 impl From<tonic::transport::Error> for Error {
     fn from(_: tonic::transport::Error) -> Self {
-        Self::IdentityFormatError
+        Self::IdentityFormat
     }
 }
 
 impl From<std::io::Error> for Error {
     fn from(_: std::io::Error) -> Self {
-        Self::TLSConfigError
+        Self::TLSConfig
     }
 }
 
diff --git a/tskv/src/file_utils.rs b/tskv/src/file_utils.rs
index a29bac5a82..f51ab06a5b 100644
--- a/tskv/src/file_utils.rs
+++ b/tskv/src/file_utils.rs
@@ -227,7 +227,7 @@ pub fn get_file_id_range(dir: impl AsRef<Path>, suffix: &str) -> Option<(u64, u6
     let mut max_id = 0;
     let mut min_id = u64::MAX;
     let mut is_found = false;
-    for (_i, file_name) in file_names.iter().enumerate() {
+    for file_name in file_names.iter() {
         if let Ok(id) = get_file_id(file_name) {
             is_found = true;
             if max_id < id {