主要研究1970年以来东北地区历次中强震前，黑吉蒙交界地区小震活动图像特征，结果发现该区的小震活动集中与否对发生在嫩江断裂两侧的中强震有一定的指示意义，并结合地质构造和部分学者的研究成果对本研究结果进行了初步分析。

In this article, we have analysed the characteristics of small earthquake activity maps in the border area of HeiJiMeng before all moderatestrong earthquakes occurred in Northeast China area since 1970. We have discovered that there is some significance of small earthquakes which may have impact to moderatestrong earthquakes on Nenjiang both side fracture. This result was preliminary analyzed combining with the geologic structure and some research achievements.