Abstract: Typhoon disaster usually is brought by typhoon rainstorm, therefore the study on typhoon rainstorm is significant. Based on RS/GIS technology, taking typhoon HAIKUI in August 2012 as a case, the data validity of TRMM and FY precipitation data products are analyzed, and the spatial evolution process of the heavy rainstorm is simulated. The monitoring results indicate that the two products show well consistency with actual rainfall data and the correlation coefficients reach 0.9948 and 0.9145 respectively; these two satellite rainfall data could reflect the center of heavy rainfall well; by comparing the average precipitation and processes obtained by TRMM data, FY data and measured data respectively, it can be found that a similar evolution trend exists, which could obviously reveal the spiral structure of typhoon, and also has high consistency with the typhoon developing route. The results prove that these satellite data have great application potential in forecasting typhoon track and heavy rainfall center.