Abstract: The paper aims to accurately forecast the rainstorm during spring sowing in Shanxi and provide better service for farmers. The authors comprehensively analyzed the rainstorm in May 9-11, 2014 based on the synoptic theories, conventional data, numerical prediction, Doppler radar and FY- 2E infrared satellite data. The results showed that: north vortex and south trough at 500 hPa and low-lying from east to west in north China on the ground were advantageous circulation backgrounds producing rainstorm; the low-altitude shear line and southeast wind at 850 hPa were the main impact systems of this rainstorm; the heavy precipitation was directly responded to the low and medium clouds which were inspired by the wind shear lines on the low and medium level of the troposphere; the ground convergence lines appeared 1-2 hours in advance, which had obvious reference significance for the short-time forecast of rainstorm; the confrontation between the cold air from the east and the west, the stagnation of the ground convergence line, formed the vertical structure of the irradiated on the upper air and convergence on the lower level, which strengthened the rising motion continuously; the important reasons for the long duration of rainstorm were the continuous transportation of the highest temperature from several days ago, and the continuous delivery of the warm and wet current on the lowlevel of the troposphere.