English：

The types and common defects of the external wall joints in the prefabricated concretebuildings are summarized and the existing waterproofing structures and related sealing materials isintroduced. This paper analyzes the causes of water leakage in exterior wall joints and related constructionquality detection technology, and discusses the development trend of exterior wall joint waterproofingtechnology. In practical engineering, a combination of structural waterproofing and material waterproofingis commonly used for joint waterproofing. Reasonable waterproofing forms should be selected for differenttypes of joints. Sealants with high adhesion, strong displacement capacity, excellent weather resistance,decorability, and pollution resistance, such as modified silane polyether sealants and modified silanepolyurethane sealants, are recommended. The main reasons for water leakage in external wall jointsinclude unreasonable waterproofing structure design, insufficient construction process accuracy, improperselection of waterproofing materials and measures, and lack of effective joint construction quality testingtechnology. To address these issues it is essential to develop non⁃destructive testing technologywith highintelligence and reliable testing results, and formulate corresponding technical standards and managementsystems. Meanwhile, professional technical personnel should be trained for regular inspection andmaintenance. These measures can enhance testing efficiency and reduce testing costs.