To solve the phenomenon that the existing Wi-Fi module will fail to connect when accessing to the wireless network, a joint distribution network scheme of "intelligent distribution network" + "soft AP" is proposed. Firstly, enter the intelligent distribution network, and use the listening mode of Wi-Fi module to capture the distribution network data for connection. If the intelligent distribution network fails, the Wi-Fi module will enter the soft AP distribution network mode, and the user will send the SSID and password of Wi-Fi for distribution network. After the success of distribution network, the system uses MQTT transmission protocol for background binding and registration. On this basis, aiming at the problem that the distribution network time of products is too long in the distribution network, the contract frequency is tested, and the contract frequency range with the shortest distribution network time is obtained. The test results show that the distribution network time of this method is within 4058ms, and the success rate of distribution network is improved, which can provide reference for the design work of IOT engineers.