To calculate the proportion of evaporative emissions of the China VI, this paper establishes a single-vehicle evaporative emission model for light gasoline vehicles, and an activity level model based on the car use habits of the employees of China Automotive Technology Research Center Co., Ltd. The proportion of evaporative emissions from Vehicle-A and Vehicle B, the running loss emissions of both Vehicle-A and Vehicle B account for over 50%, while refueling emissions and the diurnal 48-hour emissions account for lower proportions. The total annual evaporative emissions of vehicle A can reach 353.496 g, and the total annual evaporative emissions of vehicle B can reach 589.758 g.