diff --git a/pkg/scheduler/objects/node.go b/pkg/scheduler/objects/node.go
index fcce3c7fb..86d8edba3 100644
--- a/pkg/scheduler/objects/node.go
+++ b/pkg/scheduler/objects/node.go
@@ -262,8 +262,8 @@ func (sn *Node) GetAllocatedResource() *resources.Resource {
 
 // Get the available resource on this node.
 func (sn *Node) GetAvailableResource() *resources.Resource {
-	sn.Lock()
-	defer sn.Unlock()
+	sn.RLock()
+	defer sn.RUnlock()
 	return sn.availableResource.Clone()
 }