Abstract: Characteristics and main installation steps for the piping of the reactor heavy water loop system were introduced in this paper.According to the system design,equipment accommodation and spot management,main issues with effect on the quality and schedule of pipeline installation were analyzed.Accordingly,some solutions were put forward,which included: work allocation should be made clear in documents;installation preparative such as design checkup and technology communication should be prepared completely;requirements of system cleaning,test items in every experiment,inspection in work and equipment maintenance should be considered in the system design;perfect documents distribution system and stock plan should be built;technology requirements and quality assurance should be claimed in contracts;quality should be controlled by way of external evidence,inspection in manufactory,exterior quality assurance examination,and test during consignment;series of management procedure should be established in detail.