This paper introduces the application and development of current 20KV power distribution grid at home and abroad, analyzes the advantages of the application of 20KV power distribution grid, discusses the key problems in the implementation of 20KV power distribution grid in such aspects as switch devices, power distribution transformer, the selection of 20KV power distribution cabinet, lighting protection, grounding, power relay protection design and so on, in order to provide reference for the application and design of 20KV power distribution grid.