diff --git a/server-rs/crates/module-game-distribution/src/domain.rs b/server-rs/crates/module-game-distribution/src/domain.rs
index fedf8e68a..9684b95d5 100644
--- a/server-rs/crates/module-game-distribution/src/domain.rs
+++ b/server-rs/crates/module-game-distribution/src/domain.rs
@@ -69,8 +69,10 @@ pub fn game_distribution_version_key(
 /// 首次发布的游戏身份：由 `(ownerUserId, project_key)` 确定性派生。
 ///
 /// 确定性派生让媒体 objectKey 前缀在事务前就稳定，重试 / 并发不会落到不同命名空间；结果满足
-/// gameId 的 `[A-Za-z0-9_-]` 约束。
+/// gameId 的 `[A-Za-z0-9_-]` 约束。`project_key` 先 trim，与自然幂等键
+/// [`game_distribution_version_key`] 的归一化口径一致，避免 `" proj-1 "` 与 `"proj-1"` 派生出两个身份。
 pub fn derive_game_distribution_game_id(owner_user_id: &str, project_key: &str) -> String {
+    let project_key = project_key.trim();
     let mut hasher = Sha256::new();
     hasher.update(owner_user_id.as_bytes());
     hasher.update([0]);
@@ -278,6 +280,11 @@ mod tests {
         let other_owner = derive_game_distribution_game_id("owner-2", "proj-1");
         let other_project = derive_game_distribution_game_id("owner-1", "proj-2");
         assert_eq!(first, again);
+        assert_eq!(
+            first,
+            derive_game_distribution_game_id("owner-1", "  proj-1  "),
+            "project_key 两侧空白必须归一化"
+        );
         assert_ne!(first, other_owner);
         assert_ne!(first, other_project);
         assert!(first.starts_with(GAME_ID_PREFIX));