Abstract: Combining with the development trend of agricultural machinery, the authors summarized the main features of virtual terminal(VT)(ISO 11783 Part 6) and explained the principle of its communication with other working sets essentially. Based on that, a method using XML notation to define object pool mask of each working set was described, which provides the needed flexibility for data transmission between ECUs and VT, and it can be easily used to organize and modify the acquisition data of ECUs. Moreover, a uniform and convenient information handling flow for network ECU nodes design was put forward. Application results proved that this method was effective in shortening the development cycle of intelligent network bus communication system for agricultural machinery.