The utility model provides a cable -stay bridge girder hang basket hang water with cast -in -place combination of support construction counter weight system, includes reinforced concrete's scaffold frame basis and counter weight structure system, scaffold frame basis on the dam basis, the side slope is basic and the dam is basic down, the counter weight structure system includes counter weight basis and end bay piece concrete, still includes reverse pre -compaction prestressing tendons. Reverse pre -compaction prestressing tendons arranges in every end bay piece at suitable bridge to the one side of keeping away from the cable -stay bridge king -tower. The utility model discloses a mode of the reverse pre -compaction of stretch -draw finish rolling screw thread is through pre -buried finish rolling screw thread in the counter weight basis of resisting finish rolling twisted steel in the preparation of scaffold frame base bottom to pour the effect that the girder top surface stretch -draw finish rolling twisted steel who finishes reaches increases the load, open loading and the uninstallation of accomplishing the counter weight with stretch -draw to putting of precision rolling deformed steel bars in the work progress, convenient to use, it is nimble to apply the counter weight.