Abstract: This paper analyzes the relationship between the landslide disaster and the early precipitation in Sichuan Province from 2014 to 2018, constructs the meteorological forecast model of landslide disaster, and verifies the application effect of the model in the extend-month scale, which provides theoretical reference for the prediction of landslide disaster in Sichuan Province during the extend-month period.Based on the historical measured precipitation data, the precipitation in the first 45-day, 35-day, 25-day, 15-day, 10-day and 6-day of geological disasters in Sichuan Province was statistically analyzed.The results showed that the occurrence of landslide and its correlation is gradually diminishing.On this basis, combined with logistic regression method, the weight relation of the precipitation in the 2-day before the occurrence of landslide disaster was analyzed, and the probability value of precipitation induced landslide disaster was obtained.The weight coefficients of the background value of the landslide disaster prediction model and the probability value of the landslide disaster induced by precipitation are determined again.Finally, the critical rainfall in the three regions of Eastern Sichuan, Western Sichuan and Southwest Sichuan are calculated respectively, and the landslide disaster prediction model is optimized.The results show that the influence weight of precipitation on the day of occurrence, the precipitation in the 1-day and the precipitation in the 2-day before the landslide disaster in Sichuan Province are 0.048, 0.031 and 0.029 respectively.The weight parameters of the probability value of the landslide disaster model and the probability value of the landslide disaster induced by precipitation are 0.249, 0.751 in Eastern Sichuan, 0.655 and 0.345 in Southwest Sichuan, and 0.501 and 0.499 in Western Sichuan.There are obvious differences in the calculation results of regional critical rainfall.The critical rainfall value is the highest in Eastern Sichuan, the second in Southwest Sichuan, and the smallest in Western Sichuan.The application effect of the landslide disaster prediction model in the extend-month scale is verified by using CFSv2 precipitation prediction product, which proves that the model has a good overall prediction effect on the extend-month landslide disaster.