Test method for optimizing road load test

The invention discloses a test method for optimizing a road load test. The test method comprises the steps of when the running-in mileage of a vehicle reaches over 30000km, preparing the vehicle, andensuring that a test site, an environment temperature and a wind speed all meet requirements; fully preheating the vehicle for more than 40 minutes; dividing a reference speed point, and obtaining a segmented speed interval corresponding to segmented sliding; according to the segmented speed interval, according to the sequence of the speed sections from high to low, continuously completing the sliding test of one segmented speed interval, carrying out vehicle heating for more than 20 minutes, then continuously completing the sliding test of the next segmented speed interval, and obtaining morethan six sets of effective test data in each sliding test; arranging test data and calculating statistical precision; calculating a road load measurement result, and correcting the road load measurement result to a reference