Abstract: Using the typhoon base data of Dopplar weather radar and Zhejiang automatic precipitation station data in 2004 and 2005, the Z-R relation of typhoon precipitation suiting the local area is set up, which is confirmed to be available. It is applied to estimate the precipitation of typhoon "Nanmadol" and "Khanun", with comparing with the real precipitation and the estimated precipitation based on Z-R relation of American WSR-88D. It shows that in an area with small rainfall, the estimated precipitation by use of Z-R relation of American WSR-88D is more close to the fact than the precipitation with using the target relation. However, in an area with heavy rainfall, the latter is more close to the fact than the former, which the rainfall is seriously underestimated. Also, causes of the main error are further studied.