With the rapid growth of urban power load and the amplification of power supply range , adding distribution transformers is an effective way to solve the problem of power supply-side to meet the requirements of increasing electricity consumption in the case of existing distribution voltage levels. Due to the limited location of commodity blocks and the difficulty of merchant coordination, it brings great difficulties to add new distribution transformers. Therefore, single steel pipe transformer is proposed to apply to coastal city in this paper and its biggest feature is that the transformer and distribution box are installed on the single steel pipe, which could greatly save the urban area. Through the comparison and case analysis of traditional bench transformer and cabinet transformer, it is proved that the application of steel tube transformer in Hainan coastal city is feasible.