With the growth of four countering capability of the radar network in electronic warfare，the allocation power of jammer becomes a key to the aircraft penetration. For this reason， a method of power allocation based on threat evaluation of collaborative electronic jamming is given. A kind of the radar network threat assessment model is established，and the basic methods of the model through standardization calculate the radar threat assessment value of each attribute corresponds to get radar threat assessment value standardization matrix. The paper obtains a relative degree through calculation of the distance and an ideal solution，and comprehensive threat level calculated for each member. A reasonable power distribution can be performed through the threat level proportion of the radar network on the premise of limited jamming power. Finally, the simulation shows that the method is feasible. The results show that in selecting appropriate radar network for evaluating parameters，interference power allocation can be achieved by using the method, and has a certain reference value for further research in this field.