Abstract: To enable the users to collect the data regarding the key model parameters quickly under the circum‐stance of lacking the data resources ,this paper ,based on localized MOVES model ,introduces the concept of sensitivity a‐nalysis factors (SAF) commonly used in economics and investigates the degree of the influences of the parameters inclu‐ding speed and meteorology etc .on the emission factors of common vehicles in the city of Shenzhen ,China ,based on the defined grades of the absolute values of SAF .The results show that the SAF values of various pollutants range from one to 6 when the speed is less than 25 km/h .Thus ,the speed is considered as a sensitive parameter ;the SAF values of the vehicles at the age of 0~3 years are larger than one and are subject to very rapid deterioration ;the sulfur contents are sensitive parameters only for SO2 emission factors of vehicles whose SAF values are greater than one .The Reye vapor pressure (RVP) has an effect on CO emissions of private vehicles in particular ;temperature is considered as an insensitive parameter for T HC ,CO and PM 2 .5 of the diesel vehicles ,and the humidity is not a sensitive parameter for medium and heavy duty trucks ,community buses and transit buses ,with the values of SAF less than 0 .1 .The model parameters show different sensitivities for different pollutants from various types of vehicles .