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Aiming at the problem of the analysis and optimization on the hydraulic excavator attachments' digging force, the research about the relationship of the key hinge points' location and the largest digging force was put forward. A co-simulation method of the dynamics of mechanical systems and hydraulic systems was introduced to establish the attachments virtual prototype model. On the condition of that the bucket and boom cylinder were locked and the stick cylinder pressure was closed to the largest system preesure, the digging force diagram within the working range was analyzed and the maximum stick digging force was also concluded. On this basis, the maximum digging force was selected to the design goal, through experimental design and Monte Carlo methods, the influence of the key hinge points' spatial location to the maximum stick digging force were studied. The results indicate that the hydraulic excavator digging force is close to similar foreign products, and at the same time, the location and value of the stick digging force are find out which provide a valid basis for the optimization design and structural strength analysis of attachments. [ABSTRACT FROM AUTHOR]