This paper presents a underground circuit system solution based on the small diameter embedded systems. This solution collects the signal of the FOG IMU and accelerometers, and solvers the collected data. The underground circuit systems uses Manchester coding to realize halfduplex communication with the ground systems, encodes and decodes the data through ARM software programming, to achieve the remote communication with the ground systems. Practical tests show that this system is able to acquire signal of IMU and communicate with the ground system stably and reliably, and this system’s size is small, low power consumption, and can work in the environment with high temperature.