Abstract: A damage would occur to the plane truss structure of the Daqing West Ｒailway Station due to the lack of effective support outside the plane and the complexity of acting load on the structure，as well as to the huge span crossing two layer floors and the high structure altitude，and also due to the rigid connection nets among the members． In order to study the global stability of the cross-layer plane trusses with larger load of the Daqing West Ｒailway Station，the sub structure analysis method and large displacement control theory were used to analyze nonlinearity stability bearing capacity of the plane structure，which confirmed the buckling mode and stability bearing capacity of the plane truss structure and estimated the safety for the global structure． It was clearly found that the buckling mode of the cross-layer plane truss structure to be a half wave curve outside the plane，which also showed the instability characteristic for the truss after buckling． Obviously，by using nonlinearity stability bearing capacity analysis methods，the global stability coefficient was greater than 2 in all cases，which could meet the requirements for the stability bearing capacity in Chinese design code．