diff --git a/src/com/taobao/rigel/rap/mock/service/impl/MockMgrImpl.java b/src/com/taobao/rigel/rap/mock/service/impl/MockMgrImpl.java
index 027201c10..86e53c5be 100644
--- a/src/com/taobao/rigel/rap/mock/service/impl/MockMgrImpl.java
+++ b/src/com/taobao/rigel/rap/mock/service/impl/MockMgrImpl.java
@@ -645,6 +645,7 @@ private String mockjsValue(Parameter para, int index) {
 	private String processMockValueWithParams(Parameter para, String mockValue) {
 	
 		Pattern p = Pattern.compile(Patterns.MOCK_TEMPLATE_PATTERN);
+		if (mockValue == null) mockValue = "";
 		Matcher matcher = p.matcher(mockValue);
 		while (matcher.find()) {
 			int c = matcher.groupCount();