diff --git a/api/e/codes.go b/api/e/codes.go
index b4324196..a0ff6985 100644
--- a/api/e/codes.go
+++ b/api/e/codes.go
@@ -5,6 +5,7 @@ var Codes = map[string]int{
 
 	"REQUEST_BODY_ERROR": 40001,
 	"UPLOAD_FILE_ERROR":  40002,
+	"OVERLOAD_MAX_SIZE":  40003,
 	"NOT_FOUND":          40400,
 	"USER_NOT_FOUND":     40401,
 	"RESOURCE_NOT_FOUND": 40402,
diff --git a/api/resource.go b/api/resource.go
index a5ad216f..3098e140 100644
--- a/api/resource.go
+++ b/api/resource.go
@@ -31,7 +31,12 @@ func handleGetMyResources(w http.ResponseWriter, r *http.Request) {
 func handleUploadResource(w http.ResponseWriter, r *http.Request) {
 	userId, _ := GetUserIdInSession(r)
 
-	r.ParseMultipartForm(10 << 20)
+	err := r.ParseMultipartForm(5 << 20)
+
+	if err != nil {
+		e.ErrorHandler(w, "OVERLOAD_MAX_SIZE", "The max size of resource is 5Mb.")
+		return
+	}
 
 	file, handler, err := r.FormFile("file")