Releasing the“Interim Regulations on Online Taxi-hailing Business Operations”, Chinese government establishes the legal status of the online car-hailing service. However, the problems exposed in practice are how to ascertain the tort liability after the traffic accidents. This is where the existing guidelines and regulations are vacant. Therefore, the further research is necessary. The key to solve the problem is to ascertain the subject of the tort liability of online car-hailing. Currently the business scope of the company of the online car-hailing platform mainly includes taxi, fast ride, tailored taxi service, Car-sharing, and Chauffeur Drive. And there are legal relations between the owner of the car and the company of the online car-hailing platform, such as intermediary contract, labor contract and affiliated contract. According to the corresponding situations, the owner of the car and the company of the online car-hailing platform should share the responsibility severally or bilaterally.