Abstract: Tibet Convention and Exhibition Center project is located in high altitude，low oxygen levels in Lhasa area，with the complexity of roof shape，height，large span and lots of pipes，a construction plan of the outer part of the roof lifting by combining unit，the internal part of roof by integral lifting technology is established． Nonlinear finite element analysis of the construction process verified the feasibility of this technique． Analyses were performed for synchronized hoisting and unsynchronized hoisting，the forces of the lifting frame were then analyzed to provide theoretical support for the safety of the construction．