In order to improve the processing capacity of single boards in network Access Controllers（AC） for accommodating the constantly growing number of users and daily increasing amount of network data

this paper adopts a multi-board communication strategy

introduces its basic principle and analyzes in-depth the key factors affecting its performances.Furthermore it proposes a method appropriate for multi-board communication and the programming.By the dynamic regulation of the AC to associate the modules in every board

it operates the traffics in the corresponding board so as to ensure the load balance of every data flow.Taking into account the performances and operation of all the boards

it improves the overall performances of the AC system and reduces the cost.