Abstract: Section distortion, fold, collapse and other stretch bending defects are often caused at the corner of doorframe of car during stretch bending process，which resulting in quality problems of stretch bending parts. In order to solve the above problems, the reasons of defects were analyzed, the die and stretch bending process were researched，and technology solutions of step by step stretch bending die welding repair method, adding auxiliary process, increasing tensile force and side pressure etc. were proposed.Based on the proposed solutions，actual stretch bending was conducted. The test results of bended workpiece show that the tolerance of workpiece meets the requirements, which verifies the effectiveness of proposed solutions, and it is suitable for application in doorframe of car production process.