Research conclusions:(1)The anticipated governmental financial fund in future is the source of BT Mode repurchase payment，due to the financial fund is different from other financing resources and its actual sum is uncertain，that the repurchase risk is the most important problem in front of investors. (2)The risks are mainly reflected in four aspects that the repurchase consciousness of the government party is still undeveloped，the government party may deliberately postpone the repurchase action，the repurchase guarantee can’t be honored and the repurchase price is subject to final audit. (3)It should enhance legal argumentation，endeavor to obtain repurchase guarantee from government party，include sophisticated business clauses in contract and seek remedial measures which are the significant legal control means to fight against governmental repurchase risks. (4 ) The research conclusions can be applied in the management fields and repurchase of project investment and financing construction mode.