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The Tropical Cyclones （TC）with similar tracks generally have similar rainstorm patterns， but Typhoons FungWong （0808） and Norris （8012） are exceptions， which have similar tracks but different precipitation distribution. The rainstorms of FungWong distributed in two sides of the track， but those of Norris distributed in the left side of its track. The typhoon rainstorms are diagnosed and analyzed by means of moist potential vorticity （MPV） and vertical wind shear analysis. It is found that， regardless of FungWong or Norris， MPV and vertical wind shear of both have the consistent corresponding relationship with typhoon rainstorms. The strong precipitation occurred on the vertical wind shear left side， and when vertical wind shear vectors and TC track angled differently， there occurred different heavy rainfall distributions along the TC track. The overlapped areas of negative MPV1 and positive MPV2 are usually severe rainfall areas， and the greater the positive value of MPV2 in the overlapped area， the stronger the intensity of rainstorm. Therefore， in the typhoon forecasting practice， the accuracy of rainfall location forecast can be improved by using the comprehensive analysis of MPV and vertical wind shear.