Design-Build and Turnkey methods of project delivery places the duty to design and construction solely on the single entity contractor. The contractual relationships, obligations and rights of the contracting parties on Design-Build and Turnkey project delivery method based on single-point responsibility are very different from the traditional Design-Bid-Build project delivery method. This paper presents a theoretical study, which reviews the unique legal issues and risk allocation in Design-Build and Turnkey basis projects through analyzing the model forms of Design-Bid-Build, Design-Build and Turnkey contract documents published by professional associations of AIA, DBIA and FIDIC. Thus, this paper is intended to assist contracting parties in establishing reasonable contracts to appropriately allocate contractual risks.