Abstract: For the group decision making problem where the expert evaluation information is discrete fuzzy number and weight is unknown, an expert dynamic weight determination method is proposed and a new fuzzy language group decision method is proposed by combining it with TOPSIS. Firstly, the experts propose the subjective evaluation of the alternatives through the fuzzy linguistic value representation model based on discrete fuzzy numbers.Secondly, the experts' dynamic combination weights are obtained by linear weighting considering the uncertainty and similarity of the subjective evaluation. Then, the specific steps of fuzzy language group decision method based on expert dynamic weights and TOPSIS are given to achieve the ranking of alternatives.Finally, a specific application case is used to verify the feasibility and effectiveness of the proposed method.