In the dark room,It is difficult to build complex electromagnetic environment to test the performance of radar seekerantiinterference,espciallyproducting the target radar signal with the antenna scanning features; In this paper,thealogrithm of radar signal with the antenna scanning features was proposed.First,the radar antenna pattern types and the antenna scaning mode were analyzed,and the corresponding mathematical models were built;Second,the mathematical models and radar equation were combined to put forward the radar signal power calculation method;Finally,Base on the mathod the radar signal simulation software was developed,andthe radar signal was generated by vector signal generator. The test shows that signal has the feature of antenna scanning and provides protection for testing the radar seeker antiinterference in the darkroom.