By considering the uncertain character in practical decision procedure,the fuzzy loss functions were induced to decision-theoretic rough set theory(DTRS) based on the BayesianB decision theory.With respect to the minimum Baye-sian expected risk,a model of fuzzy decision-theoretic rough set theory(FDTRS) was built.The corresponding propositions and criteria of fuzzy decision-theoretic rough set theory were also analyzed.An example of enterprise credit assessment was given to illuminate the proposed model in applications.