diff --git a/io.sc.engine.rule.core/src/main/resources/io/sc/engine/rule/core/code/java/template/lib_render.tpl b/io.sc.engine.rule.core/src/main/resources/io/sc/engine/rule/core/code/java/template/lib_render.tpl
index 9f2f3f1e..4778c835 100644
--- a/io.sc.engine.rule.core/src/main/resources/io/sc/engine/rule/core/code/java/template/lib_render.tpl
+++ b/io.sc.engine.rule.core/src/main/resources/io/sc/engine/rule/core/code/java/template/lib_render.tpl
@@ -3,6 +3,8 @@
   static class #(className(lib.code,lib.version)) {
     #(tabs(IndicatorGenerator.generateFields(lib.indicators),2))
 
+    #(className(lib.code,lib.version))() throws Exception { }
+
     //通过输入参数构建指标库对象
     public void convertArgument(Map<String,Object> map) throws Exception {
       #(className(lib.code,lib.version)) arg =this;