Ground towbarless traction safety is the focus of the civil aviation industry. In the process of towbarless traction, due to environmental and human factors, the traction load may be too large to cause damage to the components, and in serious cases, the body may be damaged. To reduce the occurrence of ground unsafe accidents, the paper takes TBL-180 towbarless tractor and Boeing 737-800 passenger aircraft as reference objects, builds relevant 3D models based on CATIA, and imports ADAMS-View platform through Simdesigner interface to simulate tractor start and tractor system. The movement and the tractor pass through the pit process to explore the impact on the lower drag arm load of the aircraft. Simulation results show that the traction system model is simulated under different conditions. The simulation of the lower resistance arm load and the theoretical analysis of the failure load can provide some reference and opinions for the ground traction safety.