The relationship between the ｐroving ｇround (PG) strength test of vehicle sand customer usage is studied. The vehicle durability test regulation is established on the basis that the damage of PG equals that of the customers. All relevant data of the customers′ vehicles and the PG vehicle is recorded by a transducer on a vehicle. The fatigue load spectrum matrix is calculated with the rain flow counting method, and the causing false damage is worked out. The percent of miles on different roads and the cargo loads of different usersare surveyed. According to the acquisition signal and the customer survey, the customers′ road fatigue damage is simulated based on the Monte Carlo method, and 90% of the customer′s vehicle fatigue load spectrum (the rain-flow matrix) is confirmed. Comparing parameters of the load spectrum of PG damage with that of usage damage, we finally determine the experimental conditions of the PG strengthening roads, including the test miles and test speed. The results are able to exactly predict the vehicle bearing structure potential failure, and to effectively shorten the test mileage and product development cycle.