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Aim at the problem of wheel load change when the vehicle is running on standard road surface, taking a certain type of electric drive four-axle wheel vehicle as the research object, the vehicle model and standard random road surface were built by ADAMS, and the simulation tests of different road surface and different speed conditions were carried out. The test results show that the pavement model meets the standard power spectral density, and the vehicle tires respond well to the road. The road conditions and vehicle speed have different effects on the dynamic load of the wheel.