Abstract: The relationship of seasonal variation and interannual change between tropical western Pacific warm pool and western Pacific subtropical high have been discussed. The seasonal variation trend of western Pacific warm pool area is the same as that of subtropical high area. The latitudinal translation of warm pool center is contrary to the westw ard ridge point of subtropical high, while the longit udinal translation is same as 500 hP a mean position of subtropical high in seasonal variation. Western Pacific subtropical high falls behind warm pool about 3 months in interannual change. Western Pacific subtropical high area index in June, July and August can be predicted well by using warm pool area index of 28℃ or 29℃ for the same year.