Abstract: In this paper,we predicted the secondary disasters of earthquakes in the north of Hebei province on the basis of a vast amount of investigation data.It is considered that the fire,Poisonous gas leaking and flood disasters are possibly serious seismic secondary disasters after earthquakes.The situation on which there is possibility of the disaster has been presented.We should pay a great attention to the diacharge or scatter of poison,corrodent and radioacative element caused by earthquake catastrophes.