Abstract: In view of the fact that traditional protocol conversion gateway in the Internet of things (IoT) just implements the conversion between protocol data, when the network environment changes, it is difficult to implement the data path effectively. An IoT communication architecture with the assist tance of the communication auxiliary gateway is proposed. The backbone network is composed of the IPv6 gateway, the communication auxiliary gateway is used to realize the protocol interconversion and communication between the regional network and the IPv6 network, and the ZigBee, Bluetooth and other protocols are used for the short distance transmission within the regional network. Finally, a simplified protocol message format is designed, and the architecture model is built based on the Ptolemy Ⅱ modeling environment. The simulation results show that the interconnection between the IPv6 network and the subnet of IoT can be realized more effectively with the assistance of the communication auxiliary gateway, even if under the situation of packages missed.