Abstract: Three-dimensional (3D) textile composites have the advantages of excellent mechanical properties, designability, and near-net shape, and are regarded as ideal candidates for key components of aviation and aerospace vehicles. The mechanical properties of machining connection of 3D textile composites are the key guarantee in the reliable service. However, the theoretical research in this area is still very weak. Based on the requirements of the major engineering applications such as aerospace and deep sea, this paper focuses on the overview of the connection methods and processes of 3D textile composite materials and structures. Also, the non-destructive testing technologies are presented. Then, the mapping relationships between processing connection and mechanical properties are clarified, and the key issues on processing connection and mechanical properties of 3D textile composites are proposed. It is expected to provide a basis to design and manufacture 3D textile composites with the high-load-bearing and high-reliability for a better applications.