By analysis of traditional connection mode and assessment system for distribution network, a new connection mode by use of the principle of elementary connection for distribution network is presented in this paper. A feasible connection mode of distribution network is constructed by use of various combinations of elementary connection variables and inherent constraint conditions in regions of electricity consumption. An optimal connection mode can be worked out by use of Fuzzy Analytic Hierarchy Process (FAHP) to comprehensively evaluate connection modes by security, reliability and economy performances. Results of calculation example IEEE-14 node system show that the proposed method is feasible.