Abstract: The analyses of the supporting system for formwork almost just take the integrated stability of its space as its core while ignoring the contribution by the cooperation of the supporting system for formwork and the concrete floor to the reliability of a structure． In this paper，the necessity of the existence of the supporting system for formwork under the medium plate in the construction process of a structures backing deal was being established by analyzing the synergy of the supporting system for formwork and the bottom board of a subway transte station under construction with double nonlinear numerical method． It was also concluded that procumbent paraboloid was the form of the trend of the horizontal shift of supporting system for formwork under two-way load by using finite element analysis，and the open side of the paraboloid was opposite to the direction of the force，which was totally different to the decreasing trend from the top to the bottom of the horizontal shift of the supporting system for formwork under one-way load．