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A continuous heavy rain process occurred in South China from 17 to 24 June 2006, during which there existed two rainbands, one in the north and the other in the south. The north rainband (over the north and central part of Fujian Province) was resulted from frontal systems and the south rainband (over the east and central part of Guangdong Province) was in the warm areas before a front. The double rainband phenomenon has attracted much attention of Chinese meteorologists. In order to investigate the causes of frontal and warmarea heavy rains and deepen the knowledge of the two kind heavy rains, the heavy rain case is analyzed in details as a typical example of the double rainband event with hourly surface rainfall and 6hour NCEP reanalysis data. The main physical differences between the frontal and warmarea heavy rains are revealed. It is found that there exist obvious differences not only in the mesoscale rain mass activities, dynamic structure, instability mechanisms, and vertical heating profiles between Meiyu front and warmarea heavy rain systems, but also in the moisture transportation, mesoscale environment and vertical circulation related to heavy rainfall. These differences may be the reason why the heavy rainfall in warm areas before a front is difficult to simulate and forecast.