This paper uses DSGE-VAR model to analyse the affects of aggregate demand shocks, aggregate supply shocks and monetary policy shocks on our economy with an emphasis on the effects of monetoay policy shocks. The investigation suggests that 1) the long-term effects of monetary policy shocks on output growth rate gap and inflation gap tend to be zero. 2) contractionary monetary policies lead to recession, while expansionary monetary policies lead to overheating. 3) monetary policy shock effect will last for about five seasons and after 8 seasons, the effect of monetary policies will vanish. 4) the contribution of monetary policy shocks to the fluctuation in output growth rate gap is 47.6% and to the fluctuation in price is 9.62%. We can regulate economy growth by monetary policies and regulating aggregate demand and regulate price by regulating aggregate supply. On the basis of this, the investigation of the optimal simple monetary policy rules suggests that 1) giving output growth rate