Abstract: Selection using Openstack to establish cloud platform can get the most active community support, and the same time ,its open source and strong scalability are the important case by widespread favor.Neutron is an important network component in Openstack module to deal with the data flow of the whole platform, In the era of big data, Cloud computing virtualization as one of the most important characteristics, brings great improvement in the performance ,however,at the same time,because of the large number of virtual machines, the Neutron will face a huge data traffic forwarding tasks, Along with it will encounter its inevitable traffic bottleneck problem. In order to solve the above problems,we can use the SDN that software defined network technology and OpenFlow that important South interface protocol solve the traffic bottleneck problem, A At the same time,designing the monitoring system that responsible for the acquisition of virtual cluster data flow information, and feedback to the user with the latest platform load, so that the whole system platform to achieve load balancing.