Aiming at the problem that the current computer mouse has a large amount of computation and is notsuitable for the real maze terrain ,a computer mouse that can automatically find the exit in the real maze terrain isdesigned. Based on the principle of ultrasonic ranging and traditional maze algorithm, the computer mouse isapplicable to the maze terrain where the number of forks and the width of the road are uncertain ,there are manydead turns and relatively large.lt has the advantages of strong adaptability , small amount of computation , strongcompatibility and plasticity ,and has certain research value for the automatic application in the real maze terrain.