Abstract: For the sand table thumbnail model of simulating railway scene, to control the status of signal device and signal acquisition device on the sand table through the upper computer, and in order to facilitate the simulation of various functions for railway transportation, the hardware control system was designed, and the dedicated driver circuits of signal lights and turnout were designed especially. The project adopted some tools such as Visio, Altium Designer and keil uvision4 to implement the design of interface circuit, signal lights driver circuit, turnout drive circuit. The secondary development interface was provided for the upper computer. The upper computer could control the device on the sand table, collect and read the status data through the secondary development interface.