In order to effectively guarantee the enforceability of the national standard of hazard analysis and critical control points(HACCP) plan, the semantic expression of the HACCP plan for raw oyster processing in the national standard was the aim of this study. The knowledge visualization and application model(HVEM) of HACCP plan for raw oysters was proposed to semantically comprehend the HACPP plan from both the structural and data aspects. The knowledge extraction were from the dynamic and static perspectives. Knowledge was extracted to realize entity and linkage knowledge on expression, monitoring, validation and correction of critical control points(CCP) including of live oyster reception, dry cold storage, oyster meat storage, etc.. This model was to construct a HACCP plan knowledge system, to realize knowledge storage and visualization by combining with a graph database, and to give a test of HACCP quality traceability application based on the HVEM model. The results showed that the knowledge visualization application model of HACCP plan could realize the knowledge understanding, knowledge expression, knowledge storage and visualization application of raw oyster HACCP plan in a more systematic manner.