diff --git a/library/think/Response.php b/library/think/Response.php
index fff782c6..96737dcd 100644
--- a/library/think/Response.php
+++ b/library/think/Response.php
@@ -53,7 +53,7 @@ class Response
             $this->options = array_merge($this->options, $options);
         }
         $this->contentType($this->contentType, $this->charset);
-        $this->header = $header;
+        $this->header = array_merge($this->header, $header);
         $this->code   = $code;
     }