A routing search algorithm oriented to constraints on multiple quality of service(QoS)parameters for power line communication is proposed. The destination routing table

source routing table and reverse search space routing table are three routing tables stored in each node to support the proposed method. The reverse search space routing table can make this method not only suitable for asymmetric power line communication network

but also avoid local optimum and loop routing. The efficiency can be enhanced by cancelling the routing under search whenever one link of this routing does not satisfy the constraints. The reverse search space routing table should be large enough to store all routings. Large numbers of nodes can lead to big delay for a new routing search. This problem can be settled by imposing restrictions on the maximum value of the hop. When there are several routings which meet constraints

optimum routing can be selected based on the optimum function. A model is built based on the proposed method in MATLAB environment. Simulation results show that the proposed method can select the optimum routing under constraints on multiple QoS parameters. This work is supported by National Natural Science Foundation of China(No. 61172075)and Fundamental Research Funds for the Central Universities(No. 2015MS98).