The aim of this study was to investigate the status of food safety management system (FSMS) implemented at the pork slaughter plants in China, based on a detailed profile of both announced assessments carried out in 60 companies and unannounced assessments in 25 ones, with the checklist covered 29 indicators. The results from the study indicated several factors had an effect on the status of FSMS, associated with company size, location, target market, and valid certificates. The results also revealed a weakness of FSMS on good manufacture practices, including contamination control, pest control, clean and disinfection, facility environment and personal hygiene. In order to precisely measure implementation performance and better identify insufficiency, unannounced assessment was shown to be more efficient than announced assessment.