Abstract: The earthquakes in Puyang concentrating area are fine repositioned with Double-Difference Method.The concentrating and enhancing process of medium and small earthquakes in Shandong Juancheng and Henan Puyang is analyzed with the repositioning results.Combined with the seismotectonics and oil field distribution, the cause of seismic activity in the concentrating area is discussed.The results show that the relocation of earthquake has is significant to the prediction of earthquake tendency.