Based on the daily precipitation and sunshine data from April 1 to September 30,1964 to 2020 at three national meteorological observation stations in Longli,Changshun and Duyun of Qiannan Buyi and Miao Autonomous Prefecture(hereinafter referred to as "Qiannan"), if the daily precipitation is greater than 0.1mm and sunshine is 0h counted as 1 rainy weather day, and if there are more than 6 consecutive rainy weather days and the process of total precipitation is greater than or equal 30mm counted as a continuous rainy weather process. The paper analyses the temporal and spatial distribution characteristics of continuous rainy weather processes in Qiannan Prefecture, and predicts the occurrence trend of continuous rainy weather in three areas of Qiannan Prefecture by using the GM(1,1) method. The results show that, between 1964 and 2020, the inter-annual variation cycle of continuous rainy weather is 2 years in Duyun and 3 to 4 years in Longli and Changshun; The days of consecutive rainy weather and times in Duyun is more than that in Longli and Changshun, and the total precipitation is also greater than that in Longli and Changshun; The forecast cycle of continuous rainy weather in Duyun is about 2 years, and Longli and Changshun is about 3 to 4 years; The results of the study are of reference significance for the monitoring, prevention and control of continuous rainy weather and agricultural meteorological services, and also paving the way for the next study of agricultural meteorological disasters in Qiannan.