This study proposes a systematic cargo securing method for non-standard cargoes loaded on general cargo ships in Incheon Port. Despite the increasing transportation of non-standard cargoes with different shapes and characteristics, there are insufficient detailed securing standards, which frequently causes cargo damage and disputes among ship operators, shipping companies, and stevedores. In this study, international regulations including SOLAS and the CSS Code, as well as cargo securing manuals, were analyzed to establish systematic securing criteria for non-standard cargoes. In addition, external force calculations and safety factor criteria were applied to evaluate the securing safety according to vehicle weight categories. Based on the analysis, securing arrangements including the number and placement of lashing devices were proposed for each cargo weight range. The proposed securing methods were verified by comparing external forces and calculated securing strengths. The results confirm that the proposed methods can provide safe and practical securing standards for non-standard cargoes. Furthermore, the proposed approach is expected to contribute to the standardization of field operations, reduction of cargo damage, and prevention of disputes related to cargo securing.