Abstract: With the rapid proliferation of computer virtualization, emerging programmable router and increasingly improved quality of service (QoS) requirement, the concurrent multipath (CMP) becomes a hotspot in research field and gets increasing interest recently. Based on the analysis of flow relationship and forwarding granularity, a flow-based CMP cross-layer forwarding (FCCF) algorithm is proposed, and compared with the technologies of single-path forwarding and random CMP forwarding. The algorithm is able to process TCP header in IP network layer and compute the Hash value of the flow to solve the disorder problem of CMP. NS2 simulation revealed that the algorithm comes up to a better forwarding performance with higher bandwidth utilization.