To address the comprehensive evaluation of overseas wiring in less developed countries with large urban power grids, the proposed comprehensive evaluation model wiring model based on the optimal combination weighting method. Integrated optimal combination weighting method Delphi method, AHP and Entropy methods, established include reliability, economy, electrical characteristics and adaptability of four evaluation, three typical wiring for each model calculations subjective and objective index weight vector and the optimal combination, to build a comprehensive evaluation model to achieve the planning and design network reconfiguration of overseas cities with large. This design successfully applied to distribution network reconstruction project in Dhaka's Dhanmondi area, improved power supply reliability rate 0.428%, the terminal voltage deviation rate fell 0.106%, 1.754%-line loss rate has dropped, economics and adaptability have also increased accordingly.