The econimic development in the joint areas of Shanxi,Hebei,Shandong,and He'nan Provinces play an important role in the economic development strategies which our country will shift the center of development from the east to the west.However,one of the important factors that restict the economic development in the joint areas is the ecological disasters.After classifying the types of disasters,analyzing the causes of disasters,and assessing on the severity of each types disasters,the main type...