Research conclusions: (1) According to the light feature of the steel frame roof，by using the flexible tensile cable method，the active loading was conducted to the arc beam of the support base of the steel frame for controlling and adjusting the displacement of steel frame base of the roof and with the monitoring means and feedback design，it could control the internal force of the frame member effectively and avoid the demolishing and reconstruction works for the steel frame structure of the roof．In this way，the construction time of four months and the construction cost of 5.5 million Yuan could be saved．(2) Compared with traditional column support method，the 6． 45 million Yuan could be saved by using this method，with more concept of the green environment protection．(3) When needing to remain the historical style and features of the old building or consider the social influence，but it had no way to demolish the steel frame structure of the roof，the flexible tensile cable method could be used for remoulding and reinforcing the substructure of the frame on the premise of remaining the frame structure of the roof．