Abstract: The paper proposes an additional mass and damping approach combining Finite Element Method(FEM) with Boundary Element Method(BEM) to calculate underwater acoustic radiated noise from a submarine cabin of SUBOFF m odel taking into account different acoustic reflection boundary conditions.The comparison and analysis of the results show that using a cabin model of submarine replacing a full-scale model for noise estimation is feas ible,and demonstrate an agreeable directivity of acoustic radiated noise under different acoustic reflection boundary conditions,while the error of maximal sound pressure level(SPL) are much bigger,thus the influence e of acoustic reflection boundary conditions on the radiated noise of cabin model cannot be neglected.The research provides reference for noise estimation of different structures of submarine.