The paper presented the principle to offshore wind farm siteselection, the technique to connect with the power grid, the foundation type of high-piled concrete bearing platform with anticollision ability,the analysis method of wind turbine foundation structure, the test means of the pile's bearing capacity, the scheme to high-piled bearing platform construction and wind turbine integral lifting, etc. The above outcomes are achieved by study on some technical issues and certain practice including the site selection, the voltage elevation method employed in the wind farm, the design of foundation type selection, the test of pile foundation, the foundation construction, the erection of wind turbine ,etc.for Shanghai Donghai Bridge Offshore Wind Farm. They are worth recommending for reference for the planning and construction of offshore wind farm in the future.