Abstract: By analysing a large amount of data, it is found that in our country which is located in the middle and lower latitudes with great disparity in topography, the using of the number of days with temperature l00℃ as an index to divide the climatic zones is much better in revealing horizontal and vertical zonality. For the third class, the climatic regions are divided with a unified index(July temperature).The improvements made are also disscussed.