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The numerical forecast products had been applied in many stations, but the analysis and application of the rich numerical forecast products were not enough. Using the physical forecast products of T106 and the conventional meteorological data, the spring heavy rainfall events in Hubei Province from 1998 to 2001 were diagnosed and analyzed, focused on the physical factor diagnoses. The results revealed the characteristics of some physical factors and their structure, including the shape, forecast value, hierarchical configuration of various physical factors, which help understand the formation mechanisms of heavy rainfall, work out forecasting indices and the model of spring heavy rainfall location forecasting in Hubei Province, and provide references for finer heavy rain forecasting in the future.