Abstract: Deep-water scientific drilling requires drilling reentry system, but the existing technology is relatively backward and can't meet the requirements of efficient drilling. In view of the technical characteristics of the current drilling reentry system, the equipments and tools used in the system have been innovated and modified, and the construction technology has been optimized. Meanwhile, this paper puts forward the integrated operation of conductor jetting and reentry cone, unlocking running tool, underwater monitoring system ROV and the technology of multiple reentry cone and casing, which can make up for the shortcomings of the existing system, reduce activity costs and improve the operation safety and efficiency. The article introduces in detail the construction technology and technical characteristics of the existing drilling reentry system. Combining with the unique conductor jetting technology of deep-water oil exploration, the improvement measures are proposed pertinently, which can be used as significant reference for the subsequent technical development of the system and provide technical reserves for the construction of deep-water drilling reentry system of ocean scientific drilling vessels in China.