In order to realize the analysis and evaluation of big data governance level in multidisciplinary hospitals，an evaluation model of big data governance capability maturity was built on the basis of data management maturity model and capability maturity model. Hospital capability maturity of big data governance is divided into five levels：initial level，program level，standard level，management level and optimization level. Based on the characteristics of hospital internal big data governance，We established a maturity evaluation index system including three indicators。Then, the objective weighting method and the combined weighting method were used to determine the weight of each index，and the maturity of the big data governance ability of two triple-multidisciplinary hospitals was quantitatively evaluated by combining the unascertained measurement theory and evaluation method. The results showed that the big data governance of the two hospitals both achieve the normative level in the different methods，which is consistent with the actual situation of big data governance of the two hospitals. Because the subjectivity of index measurement and the stability of evaluation results are balanced, the model based the unascertained measurement theory together with information entropy can provide many valued information to multidisciplinary hospitals.