Audi A3 is the first model developed on MQB platform under the cooperation between Audi AG and FAW VW. It is an A-class compact model. Since its launch in March 2014，its sales in home has been increasing and becoming popular in home. Of which，the market share of three-box Audi A3 cars has reached more than 80%. It has the advantages of advanced chassis system and abundant and innovative entertainment systems，and the better image for safety and reliability in design. As the new benchmarking model，Audi A3 series cars are equipped with 7 air bags，pre-tension seat belts，and super high-strength heat-shaped steel in body （effectively preventing the occupants from injuries in accidents of rolling over and side impact）. The standard child seat interface design，optimized vehicle body acceleration waveform can also provide enough protection to child occupants during the collisions. For pedestrian protection，the Audi A3 adopts the advanced front cover and bumper after large number of simulative tests to reduce the impact to pedestrian. In addition，the use of active safety devices，such as ESC，can also reduce the occurrence of accidents.