In the construction of prestressed concrete cable-stayed bridges, the control of geometric line and structural internal force is very important, according to this, in recent years, China's new progress in this regard, the application of modern engineering control theory in the idea of adaptive control to form a control system, which is mainly in the structural parameter identification and cast-in-place main girder elevation of the bottom mold of the real-time correction of the key technology breakthroughs, and after several large-span prestressed concrete cable-stayed bridges in the practice of the success of the experience achieved!