The graduation project (Thesis) the purpose and significance: 1. Understand the local power system network structure, distribution, installation and construction and operation; 2. Master modern power system planning and design of the basic method; 3. Through practical engineering design, comprehensive professional knowledge to consolidate and enhance the concept works. The graduation project will be completed to address the following questions: 1. Network status and the existing problems; 2. The entire network and the district's load forecasting; 3. Power Planning and Design and its power consumption balance calculation; 4. Transformer substation settings, and capacity planning; 5. Reactive planning; 6. Conclusion. The design of the outcome of graduation: As the design for the power grid planning and design, and the main local power supply network for utility substations, the design focus on the common substation, where small hydropower planning, including the layout of the main transformer, substation capacity planning and other aspects of the design: 1. Lipu County completed a 2010 power grid planning and design; 2. Lipu County completed a 2015 power grid planning and design; 3. The planning required by the construction of the investment budget.