Using the subsurface temperature and thermal capacity data in the North Pacific and the summer precipitation and air temperature data at 160 stations of China from 1951-2002,we analyze the characteristics of the upper-ocean thermal state of the North Pacific in winter,and study the relationship between the thermal capacity and the summer climate in China,then discuss the coupling relationship between the thermal capacity in the North Pacific in winter and the summer climate in the east of China by SVD expansion.The outcome shows that according to the EOF expansions of sea temperperatures at 11 levels within the subsurace layer,the temperature of the winter upper-ocean in the North Pacific can be classified into two types of 40m and 240m depth,and both have obvious decadal characteristic.The anomalies of the winter thermal capacity in the North Pacific are similar to those,and have fairly good coupling relationship with the following summer climate anomalies in the east of China.When winter thermal capacity is higher than normal in the north and the south-east of the North Pacific,the following summer precipitation will be more in South China and North China while the summer temperature will be lower in South China;when winter thermal capacity is higher in the Kuroshio extension and the east of the North Pacific and lower in the west coast of North America,the following summer precipitation will be less in the Yangtze River valley and Northeast China,and the summer temperature will be lower in Northeast China and North China.Both of the coupling relationships of the precipitation and air temperature with the preceding winter thermal capacity have obvious characteristic of decadal time scale.