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Based on Doppler radar scan data and automatic weather station data from 2002 and 2003 and the statistical analysis method，the Z〖KG-*8〗〖CD*2〗〖KG*9〗〖KG-*9〗I relation formulas for different regions and different sorts of rainfall in the northern and central Fujian Province are obtained．Precipitation processes in 2005 and 2006 are calibrated by means of the relation formulas．The variational method and optimum Kalman Filter method (in combination with Kalman Filter and optimum interpolation) are used to calibrate the estimated rainfall with realtime data, and the calibrated rainfall is tested with the raingauge data from the Jiuquxi Valley of Wuyishan Mountain. Results for the methods are compared and analyzed．The analysis shows that the smallest error results are from the optimum Kalman Filter method and optimization method from 0 to 100 km, and the greatest error is resulted from the relation of Z=300I1. 4．