With the digitized radar observation of echo intensity,along with the information on weather conditions and hazards,as well as radiosonde data,the relationship between the radar echo parameter such as echo top and the hail probability associated with severe convection in Dongying city is discussed.The data of digitized radar echoes and the synoptic factors are used to formulate the hail forecasting model,based on the 0 or 1 recognition analysis.The results show that the recognition eqution has reference value in the hail recognition.