Currently in the domestic distribution network planning field, planners mainly depend on manpower and experience to carry out related analysis, and lack of corresponding quantitative analysis tools support. Based on the planning concept of power supply reliability, an distribution network planning calculation and analysis software is developed applying service-based architecture system, component design, version management mechanism and CIM model exchange technology. The software achieves the core functions, such as power safety analysis, reliability calculation, reactive power optimization and economic evaluation.The software provides data support for current status analysis, planning scheme optimization and planning effectiveness analysis of distribution network. In order to satisfy personalized business requirement of the domestic distribution network planning, this software realizes the quantitative analysis of different distribution network planning schemes by using computer technology and the practical experience of the planners. The software is successfully applied to the distribution network planning of a typical area in one city, which observably enhances the accuracy and effectiveness of the distribution network planning.