Abstract: The torrential rain during Aug. 30 to Sept. 01 of 1992 caused by a landing typhoon (No. 9216) is studied in this paper. This typhoon maintained its intensity and extent in the long distance travel in the mainland of China. The severe rainfall and strong wind brought by typhoon affected 9 provinces of China. The analysis shows the surface vorticity and divergence fields were asymmetric. The centre of positive vorticity locates on the east and north of typhoon. A strong convergent region extended northward about a thousand km from the core of typhoon. Next, the 850 hPa wind field and thermal field of typhoon were asymmetric. A strong southeasterly low level Jet located 500km east of the typhoon centre. The eastern part of typhoon was warm and the western cold. There was stronger warm advection in the northeast of typhoon due to the asymmetry of flow and thermal field. Because the structure of the Typhoon No. 9216 was asymmetric and it was under the strong upper level divergence which was to right side of 200hPa subtropical Jet exit region when it was traveling in Mainland China, the intensity of typhoon was maintained and the ascending motion on the northeastern part of typhoon was very strong, which caused wide area of torrential rain and severe strong wind.