Existing core components of wind power generator, various drive components, have been changed and innovated an electric drive system to a hydraulic drive system due to the enlargement of wind turbines. According as the demand for development and production of hydraulic components escalates, the importance of seamless pipe in the hydraulic line for wind power generation has been increased. This study involves formability analysis for pipes of high pressure brake in wind power generation. We evaluate a safety factor for thickness of the pipe by each outer diameter when operating pressure is applied. And, process analyses for tube sinking and plug drawing were conducted respectively in order to apply design parameters. And then, pipe bending analysis was performed for deformation of pipe. This result would be utilized to preliminary data in pipe bending analysis with plastic deformation in future research.