The North Zhengzhou Railway Station is the largest railway marshalling station in Asian areas. The overhead jacking of underpass bridge crossing underneath North Zhengzhou Railway Station has many difficulties, i.e. large crosssection of underpass bridge box, long jacking distance, large overhead area, hard line fixing, limited overhead point and overhead horizontal beam and complex structural system conversion, etc. The underpass bridge jacking is analyzed and the jacking force and overhead system are calculated. The sectional overhead and opposite jacking method is adopted in the end.