Emerging network applications, such as multimedia cloud computing, virtual reality and big data analytics, require different Quality of Service (QoS). But the current Internet infrastructure designed to provide best-effort services, is difficult to meet these requirements simultaneously in a cost-effective manner. SDN/NFV (Software Defined Network/Network Function virtualization) based network slicing technology can well meet the above various requirements. In this paper, a network slicing system architecture and workflow based on SDN/NFV are proposed. The method can implement the slicing of network link resources and virtual network functions (VNF), and combine edge computing to provide differentiated network link quality and network virtual function services for multiple users.