The control of the differential settlement subject to occur during the renovation of the existing stations of line 1 of Tianjin Metro must be guranteed. Due to the fact that these existing Metro stations are located right below the main streets with busy traffics, there exist great difficulties in the renovation of the Metro stations. From the viewpoint of construction environment protection and safety, the paper studies on the settlement of the controling structures of the Metro stations that occurs both during excavation and after renovation and backfilling and studies on the measures to minimize the differential settlement between the newlybulit structures and the existing structures. Finally, the paper recommends countermeasures for the control of the differential settlement.