Based on the observations by a CINRAD WSR-98D Doppler weather radar, and synoptic charts at 500hPa and 850hPa, satellite imagine, etc.,a case of heavy rain on November 2,2001 is analyzed. The results show that the cold/warm advection and the position of a cold front causing heavy rainfall can be determined and analyzed according to the run of zero velocity line, the movement of the heavy rainfall area can be determined according to wind fields.