Research conclusions:Based on the research on the pushing force and motion of main girder in process of Shangdi Bridge single cable plane curve of prestressed concrete cable-stayed bridge jacking on Beijing-Xinjiang Highway，it can reach the following conclusions:(1)Put forward a new method of the construction of complex curve of concrete box girder，by which it can simplify the design of the ramp and spacing device，and control pusher track of the complex curve girder. (2)Because two-point limit structure is statically determinate system in the horizontal plane，it can be calculated accurately the level of the working condition of the limit force pushing process. And the temporary pier horizontal reaction greatly reduced to the only 1 .2‰ of pushing weight，which provides the technical support for the construction security of weight of the complex curve girder pusher.(3)Tw。-point limit method is suitable for the complex curve prestressed concrete box girder bridge construction of roads，railways and municipal engineering which using the jacking method.