Abstract: Multiple conventional data,numerical forecast products,satellite nephogram and Doppler radar echo data are used to analyze a hail weather process which is successfully warned in the ancient city area of Lijiang on April 30,2011.By analyzing and summarizing,the author drawn an useful experience that three aspects were worth attention:①diagnosing weather background conditions；②paying close attention to whether convective clouds has emerged and is developing;③analyzing and grasping radar echo characteristics of the hail clouds.