Abstract:Use the tornado material from 1971 to 2005 (35a), in view of tornado spatiotemporal distribution, geographical distribution, weather system characteristics in the Pengze nuclear power plant evaluation area, using statistical methods for investigation and analysis, the result show that: evaluation of the area of the region survey for 23.58 square kilometers, including five provinces 22 city 163 counties, there were 151 times a tornado, an average of 4.31 times a year, mainly in spring summer(3-8m), most occurred in 16 to 19 o‘clock. Tornadoes mainly happened around the Yangtze river and poyang lake, rarely appears in mountain and hilly area. The mainly weather system can lead to a tornado generation including cold front, warm air mass, stationary front, squall line and tropical cyclone. Both Low-level warm wet and dry cold in the middle and upper is one of the basic conditions can lead to generate a tornado.