The traditional theoretical calculations of the longitudinal strength of the hull girders are generally based on the symmetrical hull tranverse section. This paper proposes the theoretical calculation method of the bending stress of the hull griders with the non-symmetrical ship structure. The bending stresses for a real ship are analyzed by the ifnite element calculation in order to validate the theoretical calculations. The inlfuence of the non-symmetrical structures on the longitudinal strength is presented by the comparison between the longitudinal bending stresses calcualted by the hull grider theory with and without the consideration of non-symmetry.% 传统的船体结构总纵强度梁理论计算一般是基于对称的船体横剖面，文中提出了不对称船体结构梁理论弯曲正应力的计算方法，并选取样船作为算例，结合有限元计算进行弯曲正应力对比分析，验证梁理论计算的准确性。同时对比将不对称结构视为对称结构时的梁理论计算总纵弯曲正应力，提出不对称结构对总纵强度的影响。
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