The sorting of the aeolian sand soil in the middle and southern desert is medium and better and the skewness is near symmetrical and the kurtosis is leptokurtic.
中部、南部风沙土分选性中等和较好，呈窄峰态和近对称的分布形式。
2
Then the movement feature of the market is analyzed with the GARCH model, and whether the market return follows non-linear and leptokurtic heavy tail feature is validated.