Combined the characteristics of venture enterprises, a model for evaluating risks of venture capital investment was built based on FAHP method to help venture investors make decisions. The model is characterized by the follows: (1) three hypotheses is proposed to adjust the FAHP and the area of important parameters is modified to perfect the system of FAHP theorem; (2) the formulae of three quantitative indexes is created by revising the normalization method applying to multi-objective decision and (3) an informal evaluation is  done.  The flexibility of this model was testified by a study case.