Based on the data of three dimensional lightning location monitoring in Guiyang in April 5th, radar data in Guiyang and Tuyun, and disaster investigation data, thais papaer using statistical methods to analyze lightning frequency changes during hail cloud evolution in Water town of Wudang District and Nanming District. Finally, the change characteristics of lightning frequency before and after the hail time point of two hail cases were obtained. The results can provide reference for future research on correlation between hail and lightning in Guizhou area.