By using NCEP/NCAR monthly and daily reanalysis data from 1951 to 2014 and the data of Climate Prediction Center Merged Analysis of Precipitation(CMAP) from 1979 to 2014, the thermal contrast over the key regions and the thermal differences over these areas in summer were analyzed, using synthetic analysis to discuss the impact of thermal conversion over the key regions on the onset of the East Asian subtropical monsoon, and the impact of thermal difference on the intensity of the East Asian subtropical monsoon. The conclusions were summarized as follows:When the time of thermal conversion between East Asian and Western Pacific Ocean is early(late), the onset time of East Asian subtropical monsoon is early(late), the retreat time of the East Asian subtropical monsoon is late(early), the duration of East Asian subtropical monsoon is long(short), and the onset time of tropical monsoon is late(early). The onset time of East Asian subtropical monsoon and the time of thermal conversion between East Asian and Western Pacific Ocean are consistent. And the onset of the tropical monsoon can promote the intensity of the East Asian subtropical monsoon. The thermal effect of the Qinghai-Tibetan Plateau has more impacts on East Asian subtropical monsoon than tropical monsoon. When the thermal difference between continent and ocean is bigger(smaller), the position of the subtropical ridge is southward(northward), the wind is southern(northern) anomaly at the East Asian subtropical region, the wind is westerly(easterly) anomaly at low latitude, the ascending motion at the Qinghai-Tibetan Plateau and the East Asian continent is stronger(weaker) than average state, the ascending motion at the Western Pacific Ocean is weaker(stronger) than average state. Moreover, when the thermal difference is bigger, the northwest wind from north area and the south wind from Western Pacific Ocean meet at the subtropical areas about 30°N have positive effect on the precipitation in this area. The thermal difference between East Asian including the Qinghai-Tibetan Plateau and the Western Pacific Ocean has more influence on height field, wind field and vertical velocity field than the thermal difference between East Asian excluding the Qinghai-Tibetan Plateau and the Western Pacific Ocean. The thermal difference in summer has influence on the distribution of temperature and precipitation in China.
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