Abstract: In order to guide the farmers to arrange the agricultural production reasonable, improve the ability of coping with continuous rain disaster and insure increasing grain output and promoting peasants’ income. The author analyzed the data of continuous rain from 1971 to 2010 in Wudu District, and the conclusion was as follows: continuous rain mainly occurred between May and October, but the highest occurence frequency of continuous rain was during the summer harvest period from May to July and the autumn harvest period from September to October, which was the most harmful disaster and caused the most serious damage on agriculture in mountain areas in Wudu. Combined with data about population, farmland ratio, GDP of Wudu City, etc, by the utilizing ArcGIS software, the maps of the possibility of disasters are gained. Then, by overlaying and uniting of the background of weather disasters, the vulnerability of stricken things and compartmentalizing the hazard grade, the hazard attributions for continuous rain disaster were achieved. From the map, it was concluded that: the risk grade gradually reduced from the area at high altitude to the area at low altitude, and also from the southeast to the northwest. That was to say, the risk grade of continuous rain disaster was highest at 1600 m above sea level and in the area southeast, and the lowest risk grade in the area below 1300 m and southeast. The above research results were significative to guide the farmers to arrange the summer harvest and the autumn harvest agricultural production strict and reasonable, which could prevent and relieve damage caused by continuous rain.