Abstract: Olympic Games Host City Contract is the basic document in process of preparation for Olympic Games. One of the contract parties is the Organizing Committee of Olympic Games(OCOG). It may destroy the doctrine of privity of contract if OCOG attending the contract and accepting the obligation under the contract. Olympic Games Host City Contract is an adhesive contract with the characters of comprehensiveness, durability and inequality, which also have the similar character with commission contract and administrative contract. The nature of Olympic Games Host City Contract mainly contains the following elements, such as public-private representation, uncertain contract clauses, retroactivity application. From the perspective of interests of the host city,the rights and obligations of the parties should be clarified, and the knowledge management system of the contract should be established in the process of contract signing. The role of the Organizing Committee of Olympic Games should be fully utilized in the process of contract performance to improve the transfer of contractual obligations and work on Olympic legislation. In the future,the International Olympic Committee will choose the host city by invitation instead of application, in which way can stimulate the initiative of the host city.