|A triangular crawler skidding machine was designed by studying the self-propelled system of the skidding machine. The whole structure of the skidding machine and the structure of the triangle crawler were introduced. The tractive force and power were analyzed and calculated. By using MATLAB to analyze the vehicle stability, it was found that reducing the height of the center of mass, reducing the offset distance of the center of mass and increasing the gauge can improve the stability of the vehicle. The maximum uphill and downhill slope at no load are 38.4°and 33.2°,and the slope are 37.6°and 38.1°at full load. The maximum driving angle of transverse uniform line and uniform turn are 26.4°and 22.8°. Adams was used to simulate the uphill, downhill and transverse straight motion of the vehicle when the slope was 25°. The results showed that the vehicle will have a slight abrupt change and complete the motion successfully when the slope changes. This research has certain reference significance to the development of skidding machine.