In order to diagnose 0808 typhoons precipitation in Zhejiang and Fujian provinces, the NCEP／NCAR globally 1°×1° reanalysis data have been employed to study moisture and helicity of typhoon Fungwong. The results show that there exist two main ways of moisture transport, one of which is from East China Sea, another one is from South China Sea. The moisture converges mainly at the low level of atmosphere, and the moisture flux convergence at 950 hPa can be indicatively significant to forecast where the heavy rain will fall. Before typhoon′s landfall, the moisture transport from east border played leading role, but moisture from south border did the same after landfall. The positive area of the helicity at 800 hPa will be indicative to forecast where the 6 h heavy precipitation will fall, at the same time, the strength of helicity has a positive relation with the future 6 h heavy precipitation. The input and output of water vapor indicate that the total moisture input has a more inferior guidance than the helicity, but when the total moisture input of the whole atmospheric level decreases sharply, it has been clearly found that the precipitation will become weak.