In order to solve the problem of low steering torque tracking accuracy during commercial vehicle driving, and the deviation and lag of the road feeling feedback to the driver, the calculation of Trucksim"s built-in drag torque is derived by selecting a two-axle commercial vehicle with two degrees of freedom vehicle model. The cross-coded sensor analyzes the steering wheel angle, downloads the analyzed front wheel angle to dSPACE and sends it to the CAN receiver module of LabVIEW through the CAN transmitter, and realizes the joint simulation of LabVIEW and Trucksim with the help of the steering system experiment platform. The results show that LabVIEW can well track the front wheel ground steering resistance torque output by Trucksim by controlling the simulated ground steering torque generated by PXI, and feedback to the driver with appropriate road feeling, providing a basis for the design of commercial vehicle steering system assistance .