First of all,a stochastic volatility model with leverage effect(SV-L for abbreviation) is constructed.The conditional distributions of its volatility item are proved to be two skew normal distributions,and this model is so called stochastic volatility model with skew normal distribution(SV-SN for abbreviation).Then the economic meaning of this model and the statistical characteristics of its volatility item are discussed.Lastly,using data from Shanghai and Shenzhen stock markets,this model is te...