Abstract: Industrial heritages or problems in modern city construction have been the focus of concern and controversy，Tianjin as an important port city of China in modern times，the previous light and heavy industrial production activities in the city left numbers of traces． There is no longer the traditional industry vitality in these industry bases，how to locate them is worth notice． Great errors were made in the demolitions of the buildings in the city，but also a lot of experience was accumulated． Through careful investigation，it was recognized that the idle space in the old city should be reused，and also the cultural context should be considered in the demolition and reconstruction，After all in decision-making，mistakes were mode， in a short moment theTianjin ancient fossil old Chengxiangwas lost． To achieve sustainable city construction，the continuity of development of things，equilibrium and the public should be respected． Based on the transformation ofTractor factory of Nankai District in Tianjinfor example，it is explored and find economy，balance and sustainability in the development of industrial building heritages．