Abstract: Aiming at the complex track tension of track link, the distribution of track tension on track link was studied, and the relation of track tension and outer loads was analyzed depend on the free body diagram of the idler, upper track, sprocket, and road wheels. A theoretical estimation model of track tension was built based on these analyzed results; and the track tension in different road blocks was simulated with a multi-body dynamic model. Comparing the theoretical estimation results with the simulation results, the rationality of the theoretical model was validated for track link tension.