Abstract: Wenchuan earthquake was the most serious disaster and the widest seismic area since the P. R. China was founded and had the wider area of high seismic region, which was resulted from the location of canyon area and sliding\|prone stratum, particularly the geological characteristic of Longmenshan fault. It was the giant north\|south structure with NE~SW trend, which located on the boundary of two large structures and was north part of east boundary of Qinghai\|Tibet plate, in which there were the fracture zones as the boundary except the east boundary. Longmenshan fault was composed of many fractures, which had the NE and NNE trends. Because of these fractures, its seismic type was the multi fracture seismic, therefore, it was the typical multivariate seismic.