在《清洁汽车行动环境影响效果的评价》的基础上, 进一步对天然气汽车排放因子修正系数进行了研究; 通过对重庆市主城区道路坡度的调查及进行汽车、摩托车坡度模拟排放试验、数据处理, 进行了不同坡度排放试验修正系数的研究。关键词: 汽车　摩托车　道路坡度　排放因子　修正系数Abstract:O n the basis of“Environment Effect Evaluat ion fo r the Clean V eh iclesA ct ion”, th is art icle did mo re re2 search about the revision of the em ission facto rs of CN G veh icle. Th rough a lo t of invest igat ion of diversifo rm slope grade of main roads in Chongqing, simulat ion em ission tests fo r veh icle and mo to rcycle on these different road grades and analysis of relat ive data, it also studied about the revision of the em ission facto rs on different grade road.Key words:V eh icle, Mo to rcycle, Road grade, Em ission facto r, Revision