Abstract: In order to realize reliable grid-connected power generation of Xiaoyangwo 50MW photovoltaic power station in Qiaojia County, this paper carries out design research on the 220kV line project of Qiaojia Xiaoyangwo photovoltaic booster station 220kV Haiba photovoltaic booster station. First, the core overview of the project is clarified. A new 220kV booster station and a new 220kV transmission line are built. The line length is about 13.2 km, and the conductor cross section is 2×300 mm 2. On this basis, the analysis focuses on the three core design modules of system access scheme, path scheme, conductor and ground wire selection, and completes the line body and optical fiber communication part design from the booster station structure hanging point to the Haiba photovoltaic booster station structure hanging point, and also covers lead engineering, adjacent communication line protection and project estimation. The design of this project strictly follows the relevant access opinions of Yunnan Power Grid Co., Ltd., provides technical support for the safe and efficient transmission of electric energy from Xiaoyangwo Photovoltaic Power Station, and assists regional clean energy consumption and power system optimization and upgrading.