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The wind retrieval of a mixed cloud precipitation between 19 and 20 September in Shandong Province is conducted by using the EVAP method according to Doppler radar volume data at Qihe. The retrieved winds reveal the evolution details of this precipitation process, in particular the mesoscale wind structure, the location of a convergence line, and their evolution characteristics clearly. The results indicate that changes of winds at all levels accorded basically with the results of conventional radiosonde observations. In the first half period of the precipitation process, there existed a mesoscale convergence line, and in the later period, along with the cold air strengthening, southward invasion and fully controlling the underlying layers, precipitation weakened and ended gradually. The retrieved winds can reflect the position of the convergence line simultaneously, which are useful for the selection of time and position in weather modification.