Zijingshan Grade Separation is an important part of the municipal construction project of "Four Bridges and One Road" in Zhengzhou city. Located in Zijingshan square, it is a large 3-storey urban interchange. The top floor of the interchange is through passing viaduct of Jinshui road, the upper structure is prestressed concrete box continuous beam, the second floor is five-road circular turning intersection, the inner diameter of the loop is 90 meters, the standard section of the superstructure is box type, single-box four-room prestressed system. The curve is a special-shaped plate, and the whole loop is an integral structure without expansion joint. The lower part of the two-story viaduct adopts single column pier or double column pier, and reinforced concrete bored pile foundation can secure buses, non-motor vehicles and pedestrians on the ground floor. The bridge is reasonable in structure, large in scale and complete in function. It is integrated with the Zijingshan square building and becomes a scene in the urban area.