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There are many participants with conflicting objectives in a large complex project. The project financing allocation scheme should be carefully designed, so as to avoid a free rider problem. A tripartite static game model with complete information is first put forward to formulate the interaction among participants. With the help of game analysis, three criterion and related measures are proposed to choose the most reasonable allocation scheme. Moreover, this model is also extended to the case with more than three participants. Finally, a numerical example is given to verify the validity of the proposed criterion and measures.