diff --git a/core/src/services/oss/backend.rs b/core/src/services/oss/backend.rs
index e99a58b4fe66..c39b9394f311 100644
--- a/core/src/services/oss/backend.rs
+++ b/core/src/services/oss/backend.rs
@@ -118,8 +118,6 @@ pub struct OssBuilder {
     access_key_id: Option<String>,
     access_key_secret: Option<String>,
 
-    allow_anonymous: bool,
-
     http_client: Option<HttpClient>,
 }
 
@@ -206,12 +204,6 @@ impl OssBuilder {
         self
     }
 
-    /// Anonymously access the bucket.
-    pub fn allow_anonymous(&mut self) -> &mut Self {
-        self.allow_anonymous = true;
-        self
-    }
-
     /// Specify the http client that used by this service.
     ///
     /// # Notes
@@ -278,9 +270,6 @@ impl Builder for OssBuilder {
         map.get("access_key_id").map(|v| builder.access_key_id(v));
         map.get("access_key_secret")
             .map(|v| builder.access_key_secret(v));
-        map.get("allow_anonymous")
-            .filter(|v| *v == "on" || *v == "true")
-            .map(|_| builder.allow_anonymous());
 
         builder
     }
diff --git a/core/src/services/oss/core.rs b/core/src/services/oss/core.rs
index 2755bc79c2c7..2dcaf5e18beb 100644
--- a/core/src/services/oss/core.rs
+++ b/core/src/services/oss/core.rs
@@ -62,7 +62,7 @@ impl Debug for OssCore {
 }
 
 impl OssCore {
-    async fn load_credential(&self) -> Result<AliyunCredential> {
+    async fn load_credential(&self) -> Result<Option<AliyunCredential>> {
         let cred = self
             .loader
             .load()
@@ -70,22 +70,29 @@ impl OssCore {
             .map_err(new_request_credential_error)?;
 
         if let Some(cred) = cred {
-            Ok(cred)
+            Ok(Some(cred))
         } else {
-            Err(Error::new(
-                ErrorKind::ConfigInvalid,
-                "no valid credential found",
-            ))
+            Ok(None)
         }
     }
 
     pub async fn sign<T>(&self, req: &mut Request<T>) -> Result<()> {
-        let cred = self.load_credential().await?;
+        let cred = if let Some(cred) = self.load_credential().await? {
+            cred
+        } else {
+            return Ok(());
+        };
+
         self.signer.sign(req, &cred).map_err(new_request_sign_error)
     }
 
     pub async fn sign_query<T>(&self, req: &mut Request<T>, duration: Duration) -> Result<()> {
-        let cred = self.load_credential().await?;
+        let cred = if let Some(cred) = self.load_credential().await? {
+            cred
+        } else {
+            return Ok(());
+        };
+
         self.signer
             .sign_query(req, duration, &cred)
             .map_err(new_request_sign_error)