Based on the potential flow theory,the linear wave hypothesis and the method of matched eigenfunc⁃tion expansions were applied to solve the diffraction and radiation problems of the floating box⁃type breakwater. In the region II,eigenfunction expansions were in the form of the division of two hyperbolic sine(cosine)functions, which were conducive to the numerical convergence. The effects of width,draft,height of gravity center and preten⁃sion on the transmission coefficient of the breakwater were studied. The results indicate that increasing the width and draft of the breakwater can reduce the transmission coefficient. The height of the gravity center has little influ⁃ence on the wave dissipation performance of the breakwater. The vertical position of the center of gravity varies in a large range,while the transmission coefficient has almost no change. As to the effect of pretension,the transmis⁃sion coefficient can be reduced by increasing the pretension in long wavelength region. However ,in the short wave⁃length region,the increase of the pretension raises the transmission coefficient.%基于势流理论，采用线性波假设和特征函数展开匹配法求解了箱型浮式防波堤的绕射和辐射问题。为提高收敛性，在流域Ⅱ中特征函数采用两双曲正（余）弦函数相除的形式。研究了浮堤宽度，吃水，重心位置和锚链预张力对箱型浮式防波堤透射系数的影响。计算结果表明，增加箱型浮堤的宽度和吃水可以减小透射系数。重心位置对箱型浮堤消波性能的影响很小，在相当大的范围内变化重心的垂向位置，透射系数几乎没有变化。锚链预张力并不是越大越好，在入射波波长较长的区间内，增加预张力可减小透射系数，在波长较短的区间内，增加预张力反而会使透射系数增大。
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