In the process of urbanization，the highly owning amount of private cars causes the emptily loading of passengers，so the transportation resources piss away a lot. The private carpooling is a kind of effective ways to solve the transportation problem，however，there are many risks in the carpooling process. Based on this，this paper firstly expounds the research situation of private carpooling risk，then analyzes the possible risks in private carpooling，and finally innovatively proposes many effective risk control measures. The research in this paper can provide theoretical guarantee for safe and rapid development of private carpooling in China.