Research conclusions：The successful application of the synchronous jack-in method in jacking in the steel girder on many spots shows the technical difficult problem of building the large-span bridge on river has been overcome, another mutual technology for building bridge has been formed and the control of the construction quality and safety is the essential to successful application of new technology and technique. For the quality control, only when the member bar manufacture and assembly, power resource and random error correction are well controlled can guarantee the entire construction quality of the steel truss girder. For safety control, the monitoring and control works should be done for the stability and reliability of the assembly platform, the measures to be taken for guaranteeing the safety of hoisting and erecting the member bars, and conduction system for jacking force.