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Recent, The propeller had high performance according as high performance of small ship. So, Wehas the development for azimuth thrusters. This Paper has structure improvement of steering support flange in azimuth thrusters. Stering support flange is very important part. because, Stering support flange supports all weight of azimuth thrusters. We has static & dynamic analysis of Stering support flange, and we discover the very safety. So, We has optimum design for the cost reduction. The first method of optimum design, We has the thicknes reduce to 30mm from 5mm. Next method of optimum design, We had added stifener. And we has the structure & dynamic behavior analysis. We had to dynamic behavior analysis. The first, We had to modal analysis. The result of 1st-modal analysis is that original model had to 76.48hz and new model had to 200.9hz. The second, We had to harmonic analysis. The result, We gave the thrust power to steering support flange. and We had to frequency analysis to 0~500hz. The result, Deflection ration reduce to 16.64.접수일 : 2007년 1월 26일, 채택확정 : 2007년 2월 10일최병근(책임저자):경상대학교 기계항공공학부 해양산업연구소E-mail : bgchoi@gnu.ac.kr Tel. 055-640-3186손정대, 최원호 : (주)효성 중공업연구소정용길 : 경상대학교 기계항공공학부