The study on the space-time characteristics of the subsurface water heat content fields in the Tropical Western Pacific Warm Pool area showed that the subsurface water heat content fields fluctuate with a large scale abnormal air-sea system. In the study area, the heat content anomaly fields are negtive during El Nino events, but positive during La Nina events. There are relatively close relations between the subsurface water heat content in winter and the precipitation in the middle and lower reaches of the Changjiang River or the precipitation in the Huanghe River-Huaihe River area. When the subsurface water heat contents are higher than normal, the precipitation decreases in the middle and lower reaches of the Changjiang River but increases in the Huanghe River-Huaihe River area. and vice versa. The subsurface water heat content in winter is of a contrary interannual variation trend to both indexes of area and indensity of the Western Pacific Subtropical High and its variation period is nearly equal to those of both indexes of Subtropical High.