Aiming at the problem of large fluctuation of the attitude and low tracking accuracy of the selfpropelled crawler robot in the rugged mountainous environment, a threedimensional rugged tracked robot control method was studied. The geometric model of dimensionality reduction kinematics was established by analyzing the kinematics model of the twodimensional flat road and threedimensional rugged road surface of the robot. Then, a sliding mode control method based on the dimensionality reduction coefficient was designed to realize the threedimensional rugged road track. The motion control of the robot and the path tracking simulation and experiment of the smooth road surface and the rugged road surface were carried out. The simulation results showed that the driving direction error was gradually decreased and approached 0 in the smooth road simulation, the lateral position deviation fluctuated within ±0.2m, and the attitude adjustment can be completed within 1s; the threeaxis position error in the rough road simulation was controlled in the range of ±10cm, the attitude adjustment can also be completed within 1s. Through the path tracking test of smooth road surface and rugged road surface, the lateral deviation after robot tracking stabilization was -2.9~8.8cm and -14.3~21.5cm, respectively, and the attitude error was controlled within ±2° and ±5°, respectively, which satisfied the actual tracking demand. 