In recent years, the implementation of nuclear engineering projects in China has gradually begun to adopt the model of engineering general contracting. However, due to different backgrounds of nuclear engineering projects and the work items carried by contracts, there may be differences, and there are no mandatory laws and regulations in the engineering field that stipulate the starting time of quality warranty and defect liability periods, It is difficult to form a unified expression for the quality warranty period, defect liability period, and equipment warranty period in different general contracting contracts. This article compares the quality warranty period and defect liability period based on relevant documents issued by the government, summarizes and analyzes the problems in the concept of defect liability period, and the application of quality warranty period and defect liability period in nuclear engineering general contracting projects. It proposes standardized suggestions for the relevant clauses of quality warranty period and defect liability period in nuclear engineering general contracting contracts, Provide reference for the signing of general contracting contracts and downstream subcontracting contracts for subsequent nuclear engineering projects.