Abstract: Basing on the data of "Earthquake Examples in China", this paper analyzed the short term and imminent anomalies before 17 moderately strong or larger earthquakes in detail and obtined 3 comprehensive characteristics of short term and imminent anomalies of the moderately strong or larger earthquakes in North China area.Based on the summing up of comprehensive characteristics of the short term and imminent anomalies, 2 quantitative comprehensive marks to identify the seismogenic process and the transition of precusory anomalies from mid term to short term have been put forward.On the principle of combining the tracing analysis of mid-term anomalies with the comprehensive analysis of shortterm anomalies, the comprehensive prediction index s value was defined and calculated, which is used as an criterion whether to make a prediction of moderately strong or larger earthquake or not.The stress of this paper is to study the short term and imminent comprehensive prediction method of earthquakes based on the analysis of the comprehensive characteristic of short term and imminent anomalies.