Abstract: To assure the safety in bulk carrier transportation and improve the quality, efficiency and reliability of the ship stowage, a design plan of formalizing knowledge base is presented. Introduced by knowledge base and using genetic algorithm, the system controls the vessel's strength in loading by optimizing the loading scheme. At last, the vessel's shear force and bending moment in loading process are optimized to the lowest extent, and the knowledge is form into a unified data structure. The loading result of program on bulk carrier shows that automatic stowage planner based on knowledge base could optimize the process of loading.