Energy utilization is a major aspect of measuring the various indicators of hybrid vehicles.The energy consumption test procedure of hybrid vehicle waits for study urgently. In this paper, the method of tests and assessment forthe fuel economy of hybrid vehicles is studied through analysis ofHEV energy utilizationexperiment.The method of hybrid vehicles fuel consumption experiment test is analyzed through experiment test on the HEV chassis dynamometer and actual road. We obtainsome regularityof hybrid vehiclesenergy consumption and hybrid vehicles fuel consumption test method through studying lightweight hybrid vehicles fuel economy. The different initial SOC of energy storage device and SOC changeaffectingfuel economy is analyzed, the study shows that the HEV fuel consumption and the net value of charge-discharge is linear relationship. A fitted line is obtained by the least square method, the intersection point of the fitted line and the vertical axis, namely Q=0, is fuel consumption.