With the traffic congestion deteriorating, the Policy restricting the growth of private vehicles is being practiced in developed city like Beijing, Shanghai and Guangzhou, etc. In order to provide reference to other city in policy decisions and implementation, we estimate the effect about the auction policy of quota of private cars in Shanghai during 2004-2017 based on Synthetic control method. The result of estimation reveals that average private vehicles reduced approximately 47% , passed the placebo test and closed to the result of DID method which prove the effectiveness of the auction policy of quota of private cars and provide scientific demonstration for the transplanting and generalizing about correlated policy.

CICTP