diff --git a/k8s/charts/seaweedfs/templates/cosi/cosi-bucket-class.yaml b/k8s/charts/seaweedfs/templates/cosi/cosi-bucket-class.yaml
index e5503abd8..4d19cc128 100644
--- a/k8s/charts/seaweedfs/templates/cosi/cosi-bucket-class.yaml
+++ b/k8s/charts/seaweedfs/templates/cosi/cosi-bucket-class.yaml
@@ -6,6 +6,10 @@ metadata:
   name: {{ .Values.cosi.bucketClassName }}
 driverName: {{ .Values.cosi.driverName }}
 deletionPolicy: Delete
+{{- with .Values.cosi.bucketClassParameters }}
+parameters:
+  {{- toYaml . | nindent 2 }}
+{{- end }}
 ---
 kind: BucketAccessClass
 apiVersion: objectstorage.k8s.io/v1alpha1
diff --git a/k8s/charts/seaweedfs/values.yaml b/k8s/charts/seaweedfs/values.yaml
index 84c637c75..2a3be6256 100644
--- a/k8s/charts/seaweedfs/values.yaml
+++ b/k8s/charts/seaweedfs/values.yaml
@@ -1629,6 +1629,8 @@ cosi:
   image: "ghcr.io/seaweedfs/seaweedfs-cosi-driver:v0.1.2"
   driverName: "seaweedfs.objectstorage.k8s.io"
   bucketClassName: "seaweedfs"
+  # Optional parameters to pass to the default BucketClass (e.g., diskType for tiered storage)
+  bucketClassParameters: {}
   endpoint: ""
   region: ""