According to the proposed improved operational laws of intuitionistic trapezoidal fuzzy number(ITFN), an aggregation operator of ITFN is proposed based on fuzzy measure and ITFN Choquet integral(ITFNCI), and the relative properties of the aggregation operator are also proposed and investigated. A prospect effect and a prospect value function of ITFN are defined based on the prospect theory, and then a prospect ITFNCI operator is constructed. With respect to a multiple attribute group decision making problem considering interactions among decision-makers, the prospect value functions of ITFNs are aggregated by using the prospect ITFNCI operator; a MULTIMOORA theory is employed to obtain a ranking of alternatives corresponding to each ordering approach; a Dominance theory is then utilized to summarize the three rankings into a single one. Finally, a practical example is introduced to show the feasibility and effectiveness of the proposed approach.