The methods of waste heat recovery from gas engine heat pump (GEHP) were analyzed theoretically. From the aspect of energy balance, the feasibility of the waste heat defrosting method was discussed, the results showed that the waste heat for defrosting was small, accounting for 6.5%~9.5% of the total waste heat, and the waste heat for refrigerant was less than 45% of the total waste heat, so the waste heat defrosting method was feasible. The waste heat can significantly improve the Cop and primary energy utilization rate of GEHP. 