The average vertical distribution of equivalent potential temperature, horizontal divergerce, relative vorticity and vertical velocity overthe observation area were computed using 6-days NAVAID wind data from the R/V Shijian and R/V Xiangyanghong 09 during FGGE (the First GARP Global Experiment) and upper air sounding data of two island stations within the same period. Yanai’s method was used to compute the vertical distributions of the apparent heat source, apparent moisture sink and total eddy heat flux. Satellite cloud photographs and surface meteorological measurements were used to subdivide the six days of observation into three disturbed days and three undisturbed or trade days. This paper describes the large-scale structure and heat budgets in the disturbed and trade wind periods and compared them with those of the trade wind regions of the Atlantic. Some interesting results of the structure and heat budgets of large-scale disturbances over the equatorial trough region in the western Pacific are The average vertical distribution of equivalent potential temperature, horizontal divergerce relative relative vorticity and vertical velocity overthe observation area were computed using 6-days NAVAID wind data from the R / V Shijian and R / V Xiangyanghong 09 during FGGE (the First GARP Global Experiment) and upper air sounding data of two island stations within the same period. Yanai’s method was used to compute the vertical distributions of the apparent heat source, apparent moisture sink and total eddy heat flux. Satellite cloud photographs and surface meteorological measurements were used to subdivide the six days of observation into three disturbed days and three undisturbed or trade days. This paper describes the large-scale structure and heat budgets in the disturbed and trade wind periods and compared them with those of the trade wind regions of the Atlantic. Some interesting results of the structure and heat budgets of large-scale disturbances over the equatorial trough region in the we stern Pacific are