Abstract: Abstract: In order to solve an uncertainty problem of 3 D geological model and hard evaluation of accuracy, the paper had an analysis on error sources during 3 D modeling process and provided the C-F Method applied to a unified measurement conducted on each stage uncertainty of 3 D geological model in order to realize an eff ective accuracy evaluation on 3 D geological model. Based on Zhahanaoer Open Pit Mine as an engineering case, an accuracy evaluation system of 3 D geological mo del for Zhahanaoer Open Pit Mine was established. An analytic method and fuzzy evaluation method were applied to define the each evidence credibility and the simple and effective AHP Method was applied to define the each evidence weight. The integration and transmission of evidences could effectively realize the accuracy quantita tive evaluation of 3 D geological model. Finally, the credibility of 3 D geological model for Zhahanaoer Open Pit Mine was 0.783 as determined. With the accounting of a ctual mining momentum value, the feasibility of the method was verified and the actual application value of the model was improved.