The comprehensive technique is a man and computer interactive system for forecasting regional torrential rain in Huabei area,which is based on numerical precipitation prediction products of HLAFS,judged by diagnosis of meteorological elements and corrected step by step by using infrared satellite images,conventional meteorological data and NWP both domestic and abroad. Experimental study shows that this technique has a remarkable ability to identify and forecast torrential rain in Huabei Area. The main characteristics of the system are the following;first,it basically simulates the forecaster's thinking and work procedure to forecast torrential rain;second,as working step by step, the system has higher transparency and is convenient for further improvement and for forecaster to know the mechanism and law of torrential rain onset and development.