The invention relates to a network flow distribution method based on the external strategy server interaction. The method includes the following steps that firstly, a Web API interface is arranged on a load balancing apparatus; secondly, a terminal client sends a request to the load balancing apparatus; thirdly, the request of the terminal client is packaged in a data packet through the Web API interface by the load balancing apparatus and then forwarded to the external strategy server; fourthly, the data packet is resolved by the external strategy server, the original request of the externalstrategy server is revised according to the need of the terminal client and then the revised data packet is returned to the load balancing apparatus; fifthly, the load balancing apparatus selects a suitable background server according to the information of the external strategy server and transmits the revised request of the terminal client to the background server; sixthly, the background serverresponds; lastly, the load balancing apparatus forwards the response from the background server to the request to the terminal client. The network flow distribution method of the invention can integrate the special strategy scheme of the primary client into the algorithm of load balancing and ensure the distribution of the network flow to be fully adaptive to the special application program of the primary client.