Aiming at the problem of multiple attribute group decision making based on interval type2 fuzzy information environment，this paper proposes a decision method of the comprehensive relative crossentropy based on total probability.Firstly，interval type2 fuzzy set is defined，entropy and the arithmetic average rank value formula are given.Secondly，based on fuzziness，hesitation and interval of the interval type2 fuzzy sets，a new method for measuring the relative crossentropy and the comprehensive relative crossentropy is defined in internal type2 fuzzy sets.By constructing the comprehensive relative crossentropy and entropy linear optimization model to solve out the attribute weights for each scheme,attribute values are aggregated to obtain the optimal scheme.Finally，an example is given to illustrate the feasibility and effectiveness of the proposed method.