theNetwork protection to protect network and its equipment, appreciating their importance and technical characteristics of scientific research, design, operation and dispatching departments. Grid structure, network operation mode, the system failure form and abnormal way change multiterminal, for quick, reliable and selective fault and termination of the abnormal state power, long-term since, research and production of various line protection, busbar protection and automatic reclosing and frequency automatic solutions, reducing load device list, meet the demand for electric power grid, the support, play an important role. This study is about 220KV power of relay protection, the master and consolidate the design of power system protection of related professional knowledge, be familiar with the theory of power system protection design steps and design skills, according to the technical standard, the selection and configuration of the relay protection, the correctness of the selection and training in engineering practice application ability, innovation ability and the ability to work design is based on guangxi university undergraduate and graduate institute of electrical up the graduation design. The design of the main content is 220KV power relay protection and the setting, because all sorts of relay protection, adapt to the changes in power system operation ability is limited, relay protection setting both their skill and relay protection configuration and selection problem, therefore, to relay protection setting schemes with different will have different protection effect, how to determine the optimal solution, the work will be engaged in the protection of engineering and technical personnel of : electric current relay protection distance protection performance累..