As a China's old industrial base, Tianjin has a large number of industrial heritages.Today the ancient city district is in the process of new development.The continuous development of service industry and sci-tech small-and medium-sized enterprises provides opportunities for the reuse and reconstruction of abundant industrial legacies.For most industrial architectures with historic and cultural value, how to deal with them is important.It was tried to make an in-depth analysis of abundant historic legacies of Tianjin and find out problems.Combining with the experiences of the foreign industrial architectural reconstruction and reuse, it was also tried to explore and perfect the notion and system for protection of industrial architectural legacy.