The contracts of major investment projects in Shanghai’s science and technology service industry exhibit characteristics such as high complexity, multiple participants, and long cycles. The traditional management model has obvious deficiencies in terms of the controllability of contract performance and process supervision. This article focuses on four key links: contract signing, execution, supervision, and risk control. It systematically sorts out the embedding mechanism of blockchain technology in contract management and proposes path solutions such as node collaborative signing, smart contract template library, full life cycle supervision platform, and on-chain early warning model, with the aim of providing practical references for improving the efficiency of major investment project contracts in the technology service industry.