Abstract: Bringing security metric as a QoS parameter is a new strategy in QoS routing.Aiming at the problems that the way of characterizing the link safety using only one security metric in QoS routing，a strategy that using multi-security metric as routing parameter is proposed.This will characterize the link safety much more exact.The authors will use the strategy mentioned before for secure routing based on differentiated service.An algorithm named MOSRA（Multi-Object Optimal Secure Routing Algorithm）based on nondominated sorting genetic algorithm under Differentiated Service Model is proposed to solve the NP complete.The simulation results show that the algorithm can provide better security performance and satisfy different serve requirements.