In order to facilitate customers to choose steering gear products and meet the demand for mass production testing on production lines, we have developed and produced the multi-function servo test module, which supports various testing modes of functions of the traditional analog steering gears and modern digital servo motors. It contains PWM, single and double wire UART, RS485, I2C, SPI and other communication methods, as well as the wide voltage programmable output and detection, and supports user-defined test instructions. It can be connected to the PC software through USB, and supports the onboard Bluetooth connection with the mobile phone, then users can control the joint movement of multi motors through the APP.