Based on the vessel "Xiangyanghong No. 14, China" and other marine meteorological data,the atmospheric diabatic budget on the West Tropical Pacific has been calculated in this paper. Some components, such as radiative heating, latent heating and sensible heating, are. analyzed. As a result, it has been pointed out that there was a heat source over the West Tropical Pacific during the investigation period.The atmospheric total heating rate is about 0.57℃/day.