Abstract: The moderate and small earthquakes in Chang Dao area(35.8°~38.7 N°, 119.4°~122.9°E) since 2000 are relocated with double difference method.Through analysis to the results, we find that the relocated earthquakes are relevant much closer with faults.The depth of moderate and small earthquakes have regional difference, which is shallower near Changdao(6km in average), but is deeper near the source region of Ms7 event in 1548(13km in average).Combined with seismicity, the earthquake tendency of Changdao area is analyzed.