Power plants in a system is the backbone of power plant systems, in a key position. In order to consolidate, "some electrical power plants," and some of the theoretical knowledge of the relevant courses, study and master power plants (substation) electrical design of the basic methods, and foster self-independent analysis and problem-solving ability to work and the actual engineering design of basic skills , which conducted the graduation design for our three-year study painting with a perfect end. Keywords: Graduation Design hydroelectric power wiring short-circuit current owner of the main electrical equipment selection