利用P波初动求解中俄交界4.8级地震的综合震源机制，通过震源机制反演震源区附近的应力场，结果表明：此次地震是略带走滑分量的正断层。主压应力场的方向是北北东方向，沿此断裂带展布。

We used P wave onset calculate comprehensive focal mechanism of 4.8 earthquake in Sino-Russian junction ，we inversed near the hypocenter area stress field by focal mechanism。The results shows：

 (1)the earthquake is a normal fault with strike-slip component；

 (2)The principal compression stress field is in NNE Along this fault zone distribution。