The Value at Risks(VaRs) of daily return of Shanghai and Shenzhen index are calculated using Equally weighted moving average(EQMA), Exponentially weighted moving average(EWMA),GARCH(1,1),GARCH(1,1)-t,and Pareto-type extreme value distribution method respectively.The back testing indicates that Pareto-type extreme value distribution method reflect the real market risk more accurately than other models.