Abstract: In this paper, FEM software ANSYS was used to analyze and simulate the Ω spring in a new stern shaft sealed apparatus. The high stress region of the spring was checked. The relations of the compression vs resistance and compression vs maximum stress were plotted respectively. Two models were considered in the computation. One was to analyze each single ring of the spring and the other was to analyze the spring as a whole. The two models agreed with each other, thus showing the reliability of the modeling technique. The computing results can be consulted during the optimal design of such Ω spring in the sealed apparatus.