Abstract: This paper investigates how drinking affects driving operations with a simulation system.Under virtual scenes made of sharp curves,emergency stop belts,obstacle zones and straight line segments,the simulation system monitors and saves real-time data of driving operations.And the variables of all kinds of driving operations are set and analyzed.The simulation results show that the driving operations have significant changes after drinking by the paired sample t-test.The results indicate that drinking affects significantly the driving operations,such as braking,steering,releasing clutch and accelerating,and that the differences of driving operations between before drinking and after drinking reduces gradually including the speed of releasing clutch and the speed and depth of stepping brake-pedal and accelerator-pedal with the alcohol dissipating.The results show that driving operations have significant changes after drinking and these differences reduce gradually with the blood alcohol concentration dropping.The study provides a reference for further quantitative analysis of the effects of drinking on driving operations.