In this paper, FNL 1°×1°reanalysis data from NCAR and conventional meteorological data were used to analyze the Precipitation Process in Guizhou Province from June 20 to 24, 2018, the results show that Guizhou is located in the high-level divergence and low-level convergence airflow at the front of the 100hPa South Asia High,it is conducive to the rise of movement. In the 500hPa, the stable circulation of two-trough-one-ridge in eurasia makes the northern cold air from the high ridge of Baikal continuously southward to the Yangtze River basin.850hPa is mainly affected by low-level jets and shear lines, The low-level jet continuously transported southwestern warm and humid air to the Southern China;The shear line is Stable from the middle of Zhejiang to the northern part of Guizhou, meanwhile the water vapor flux convergence zone in Guizhou is located on the south side of the shear line, which is conducive to the rise of water vapor convergence. Guizhou province is in the vertical motion negative zone of high-level divergence and low-level convergence,which has good ascending motion conditions. The combination of water vapor and dynamic conditions are the main reason contributing to the large-scale continuous precipitation weather in Guizhou.