Abstract: Public private partnership (PPP) can help solving the shortage of government project investment, so its financing mode selection and evaluation problemsare much more important. According to the financial evaluation method, the paper puts forward an evaluating target called "Project Financing Benefit", and from the government's perspective, it gives out the financing efficiency formula and calculation steps of BOT and BOO modes for franchising projects. After that, a coal mine project analysis is made as an example and the conclusions show that BOT mode is more suitable for this kind of project than BOO, and the reasons for the difference of the two financing benefits lie in the analysis position and calculation time. The project financing efficiency model can provide important indicators and methods for the comprehensive evaluation of these varieties of financing scheme, and the conclusions can be used for thechoice, design and optimization of this kind of franchise project financing model.

Key words: BOT, BOO, Financing efficiency