Abstract: VaR(value at risk)is a widely-used standard to measure risks in the financial market. By working out four GARCH type models(GARCH-t; EGARCH-t; GJR- GARCH-t; Beta-Skew-t-EGARCH), an empirical study is made of a series of features concerning the logarithmic Return Rate of the four models, and a Kupiec test is then made to verify the VaRs results so as to find out about which model fits best in the reality.