Abstract: Winnie(9711) and Tim(9406) are two tropical cyclones whose track and trend of direction turning are similar.Their tracks,precipitation and moving velocity are used in comparison and analysis.The results show that the track of Winnie is to the east,its increment of moving velocity is bigger after turning,and the precipitation over Liaodong Peninsula is larger;The track of Tim is to the west,its enhancement of moving velocity is smaller,and the center of severe precipitation is in North China.For their precipitation difference over Liaodong Peninsula,NCEP reanalysis 2.5–degree grid data was performed to diagnose and analyze the large-scale conditions and structural features of Winnie and Tim.The analyses show that the location of Subtropical High(SH),upper-level and lower-level jets and frontal zones are closely related to the heavy rainfall over Liaodong Peninsula,besides impacts of the topography and the sea.During the life cycle of Winnie,the favorable and stable SH caused the transportation of moist water vapor over Liaodong Peninsula,barred the low pressure system from moving easterly,and sustained the duration of precipitation.The coupling of upper-level and lower-level jets in the updraft field,the pumping of intense field of divergence in the upper troposphere and the transportation southerly of higher potential vorticity were favorable for cyclone's development and intensification.The proper intensity of cold air from the west and east made Winnie extratropical transition(ET),formed extratropical cyclone(EC) and produced severe precipitation.During the life cycle of Tim,the center of SH is to the west and north,the coupling of upper-level and lower-level jets in the downdraft field and the intensity of divergence in the upper troposphere were weaker,whose value is merely one-eighths of that of Winnie,were not favorable for the development and intensification of the cyclone.Tim located in the rear of a high-level trough and obtained negative vorticity advection,with the effect of the feeble cold air from the east,only formed weak cold front in North China,and precipitation on Liaodong Peninsula was less than 10 mm.