By using the WRF(weather research and forecasting) model,the paper simulated the seasonal tropical cyclone activity over western North Pacific from 1 July to 30 September 2006.Results show that:1) the simulated total number of Typhoons is close to that from Best-track data set.The simulated landfall TC number is less than that of real Typhoon number and it is the same for separate monthly landfall number.The simulated intensity of Typhoons is weaker than that from Best-track data set;2) the model shows better ability in reproducing Typhoon and the height and wind vertical shear fields in July,but the ability tends to be weaker as the model time increases.This suggests that the model can be used to simulate the feature of seasonal tropical cyclone activity but the time limit needs further exploration.