Earthquake is difficult to forecast, but it doesn't happen without signs or unknown,our country has the case summary for every large earthquake.Statistics clearly show that there have been 77 predictions about middle -term, short -term or imminent earthquakes in the last 40 years.Therefore, success in Chinese earthquake prediction could not be denied only because of failure in Wenchuan Earthquake prediction.China's earthquake prediction score should be positive,and Wenchuan Earthquake is not a "strange shock" without any precursor.