diff --git a/core/src/services/cos/core.rs b/core/src/services/cos/core.rs
index ef7ff14b7c48..9132f7e9fe24 100644
--- a/core/src/services/cos/core.rs
+++ b/core/src/services/cos/core.rs
@@ -356,13 +356,6 @@ impl CosCore {
         // Set user metadata headers.
         if let Some(user_metadata) = args.user_metadata() {
             for (key, value) in user_metadata {
-                // before insert user defined metadata header, add prefix to the header name
-                if !self.check_user_metadata_key(key) {
-                    return Err(Error::new(
-                        ErrorKind::Unsupported,
-                        "the format of the user metadata key is invalid, please refer the document",
-                    ));
-                }
                 req = req.header(format!("x-cos-meta-{key}"), value)
             }
         }