diff --git a/libra/src/command/commit.rs b/libra/src/command/commit.rs
index 8caa16f98..faf46c34d 100644
--- a/libra/src/command/commit.rs
+++ b/libra/src/command/commit.rs
@@ -13,7 +13,7 @@ use mercury::internal::object::commit::Commit;
 use mercury::internal::object::tree::{Tree, TreeItem, TreeItemMode};
 use mercury::internal::object::ObjectTrait;
 
-use super::save_object;
+use super::{format_commit_msg, save_object};
 
 #[derive(Parser, Debug)]
 pub struct CommitArgs {
@@ -38,7 +38,8 @@ pub async fn execute(args: CommitArgs) {
 
     /* Create & save commit objects */
     let parents_commit_ids = get_parents_ids().await;
-    let commit = Commit::from_tree_id(tree.id, parents_commit_ids, args.message.as_str());
+    // There must be a `blank line`(\n) before `message`, or remote unpack failed
+    let commit = Commit::from_tree_id(tree.id, parents_commit_ids, &format_commit_msg(&args.message, None));
 
     // TODO  default signature created in `from_tree_id`, wait `git config` to set correct user info
 
diff --git a/libra/src/command/log.rs b/libra/src/command/log.rs
index cdc1c89df..264446495 100644
--- a/libra/src/command/log.rs
+++ b/libra/src/command/log.rs
@@ -15,6 +15,8 @@ use std::collections::VecDeque;
 use std::str::FromStr;
 use mercury::hash::SHA1;
 use mercury::internal::object::commit::Commit;
+
+use super::parse_commit_msg;
 #[derive(Parser, Debug)]
 pub struct LogArgs {
     /// Limit the number of output
@@ -103,7 +105,8 @@ pub async fn execute(args: LogArgs) {
             message
         };
         message.push_str(&format!("\nAuthor: {}", commit.author));
-        message.push_str(&format!("\n{}\n", commit.message));
+        let (msg, _) = parse_commit_msg(&commit.message);
+        message.push_str(&format!("\n{}\n", msg));
 
         #[cfg(unix)]
         {
diff --git a/libra/src/command/mod.rs b/libra/src/command/mod.rs
index 2b3378dcc..9116810e1 100644
--- a/libra/src/command/mod.rs
+++ b/libra/src/command/mod.rs
@@ -9,11 +9,11 @@ pub mod log;
 pub mod merge;
 pub mod pull;
 pub mod push;
+pub mod remote;
 pub mod remove;
 pub mod restore;
 pub mod status;
 pub mod switch;
-pub mod remote;
 
 use crate::internal::protocol::https_client::BasicAuth;
 use crate::utils::util;
@@ -65,6 +65,52 @@ pub fn ask_basic_auth() -> BasicAuth {
     BasicAuth { username, password }
 }
 
+/// Format commit message with GPG signature<br>
+/// There must be a `blank line`(\n) before `message`, or remote unpack failed.<br>
+/// If there is `GPG signature`,
+/// `blank line` should be placed between `signature` and `message`
+pub fn format_commit_msg(msg: &str, gpg_sig: Option<&str>) -> String {
+    match gpg_sig {
+        None => {
+            format!("\n{}", msg)
+        }
+        Some(gpg) => {
+            format!("{}\n\n{}", gpg, msg)
+        }
+    }
+}
+/// parse commit message
+pub fn parse_commit_msg(msg_gpg: &str) -> (String, Option<String>) {
+    const GPG_SIG_START: &str = "gpgsig -----BEGIN PGP SIGNATURE-----";
+    const GPG_SIG_END: &str = "-----END PGP SIGNATURE-----";
+    let gpg_start = msg_gpg.find(GPG_SIG_START);
+    let gpg_end = msg_gpg.find(GPG_SIG_END).map(|end| end + GPG_SIG_END.len());
+    let gpg_sig = match (gpg_start, gpg_end) {
+        (Some(start), Some(end)) => {
+            if start < end {
+                Some(msg_gpg[start..end].to_string())
+            } else {
+                None
+            }
+        }
+        _ => None,
+    };
+    match gpg_sig {
+        Some(gpg) => {
+            // skip the leading '\n\n' (blank line)
+            let msg = msg_gpg[gpg_end.unwrap()..].to_string();
+            assert!(msg.starts_with("\n\n"), "commit message format error");
+            let msg = msg[2..].to_string();
+            (msg, Some(gpg))
+        }
+        None => {
+            assert!(msg_gpg.starts_with('\n'), "commit message format error");
+            let msg = msg_gpg[1..].to_string(); // skip the leading '\n' (blank line)
+            (msg, None)
+        }
+    }
+}
+
 #[cfg(test)]
 mod test {
     use mercury::internal::object::commit::Commit;
@@ -78,4 +124,19 @@ mod test {
         save_object(&object, &object.id).unwrap();
         let _ = load_object::<Commit>(&object.id).unwrap();
     }
+
+    #[test]
+    fn test_format_and_parse_commit_msg() {
+        let msg = "commit message";
+        let gpg_sig = "gpgsig -----BEGIN PGP SIGNATURE-----\ncontent\n-----END PGP SIGNATURE-----";
+        let msg_gpg = format_commit_msg(msg, Some(gpg_sig));
+        let (msg_, gpg_sig_) = parse_commit_msg(&msg_gpg);
+        assert_eq!(msg, msg_);
+        assert_eq!(gpg_sig, gpg_sig_.unwrap());
+
+        let msg_gpg = format_commit_msg(msg, None);
+        let (msg_, gpg_sig_) = parse_commit_msg(&msg_gpg);
+        assert_eq!(msg, msg_);
+        assert_eq!(None, gpg_sig_);
+    }
 }