In order to solve the issues of complex grating testing and expensive test equipment, based on ARM micro-controller STM32F103, USB 2.0 and linear array CCD TCD 1209D, a grating image speed acquisition system with acquisition and display function is designed. CCD operation time sequence is simulated by GPIO of ARM chip, and the driving time sequence is realized through software programming and auxiliary circuits. And then, CCD signal acquisition and USB transmission are realized with AD in STM32F103 and USB 2.0 controller and image display software is written in PC. The results show that the grating image signals with light and dark stripes outputted by CCD is transmitted via USB and the images of the signals can be displayed correctly by image acquisition software in PC.