The invention discloses a method for designing a network load balancer system based on ForCES. In the method, a control part of a load balancer is separated from a data part according to the design thought of a ForCES protocol, wherein the control part comprises the functions of scheduling algorithm, service configuration and management and the like, which run at a control in the form of a load balance module and are uniformly managed by a network administrator. The data part comprises scheduling dissemination of data packets, session persistence and health detection, wherein these functions are abstracted into logic function blocks of the ForCES protocol, each logic function block accomplishes a certain specific operation, and these logic function blocks are combined into the data part of the load balancer to run in a virtual forwarding element in the form of forwarding element application. Compared with the traditional load balance system, the network load balancer system has the advantages that the load balance capability is improved and the expandability and the maintainability of the system are improved, so that the system has good application prospect.