7.5°减小为4°。In order to enhance the handling stability of multi-axle vehicle, a mechanical analysis on high-speed inphase steering conditions of five-axle vehicle with all-wheel steering has been done, and the related kinematics differential equations of vehicle with 24 freedom degrees were established, the mechanical model of the tyre has been built based on Fiala-tyre model. Finally, VI sub-function compiled by C language was inserted into LabVIEW graphical codes by MathScript node. The whole vehicle dynamics simulation program has been built based on LabVIEW software. The virtual test simulation results showed that all-wheel steering technology would make rear-axle wheel steer ahead of 0.15 s, and the rear wheel could steer with the front wheel at the same time so that the steering response rate could be improved and the roll angle of vehicle body would be reduced from 7.5° to 4°.