Analyzing correlation between annual precipitation and the M≥6 earthquakes in Yunnan since 1960, we find that when the mean annual precipitation in Yunnan is less than 1 000 mm, or the number of the stations whose annual precipitation anomaly is lower than 25% is larger than 20, the corresponding probabitity of M≥7 earthquake in Yunnan Province in the following year is only 25% and 33%, respectively. Analyzing the spatial distribution of precipitation in Yunnan Province, the authors find that one year before the M≥6 earthquakes more than 80% of the total, the annual precipitation near the epicenters of the earthquakes is 20% higher than the average. The authors think that the precipitation loaded on the crust may trigger the earthquake, but it is only a modulator. The intrinsic factor is decisive for the earthquake.