Abstract:In eastern China, there is one kind of rainfall that is related to the upper troposphere anticyclone, i.e., the South Asian High (SAH). The average heavy rainfall of central eastern China in annual cycle happens in the northeastern side of the SAH ridge line and shows a quasi biweekly oscillation in latitude when the SAH ridge line shifts northward or southward. The satellite water vapor (WV) images reveal the atmosphere movement of upper troposphere. The WV image and the derived wind can describe the location of the anticyclone center of upper troposphere and its ridge line and can also trace the downward dry and cold flow from middle high latitude, which is important to heavy rainfall in summer. The small scale dark area extending southward on WV images is usually the strong potential vorticity area in mid high latitude, and it can intensify the rainfall when moving to rainfall belt. There are two severe rainfall areas related to the SAH, one is in the southwest side of the SAH and another is in the northeast side of the SAH where the flow is divergent in the upper troposphere. In the north side of the SAH subtropical westerlies exist when the westerlies are strong, the divergence in the northeast side of the SAH in the upper levels is strong, which can induce strong precipitation in China. The SAH can affect most of China when it advances and withdraws from early May to early October. As a result, the concept model of the satellite image characteristics which is got from the cases over Huaihe River region in summer can also be used in other seasons or places such as Northwest China and North China regions. The location and shape of the SAH can affect the region and intensity of heavy rainfalls and meanwhile severe precipitation also has feedback on the SAH, leading the asymmetric instability development of the SAH.