Using the intensive observation data of the torrential rainfall experiment over the both sides of the Taiwan Strait and adjacent areas,the 5.24 heavy rain in 1998 is analyzed in this paper,and its results are as follows.There is only one strong precipitation period in the middle of this heavy rain process.The relationship between moist available energy E_MA and rainfall is clear.Before the heavy rain occurred, the E_MA remarkably increased;the energy remarkably decreased when the strong precipitation began;there is a narrow recoil of energy during the strong precipitation period;the heavy rain ended when the E_MA remarkably decreased again.This heavy rain is an energy front heavy rain.Before the heavy rain occurred,energy frontogenesis had started,and the heavy precipitation is synchronized with the strong energy front. The area of the heavy rain located in the vicinity of energy precipitation front north of high-energy tongue.