This paper investigates the risk assessment of job security at anti-mob activities for National Police Security Police Sixth corps of Ministry of Interior accredited to the Executive Yuan and the Legislative Yuan for guard duty. Through discussion Document and Paul VI Corps via anti-mob activities at the Standard Operating Procedures (SOP), we identify 50 major risk factors, based on giving inducements to categorize 5M modes. Then, we use questionnaires and Operational Risks Integrated Tools (ORMIT) to conduct a risk assessment of these risk factors. Following in-depth interviews for the high levels these risk factors, we identify solutions to improve practice, and then explore solutions security agencies at anti-mob activities. Overall results show both perceived risk and actual risk of are decreased. The average risk level from height H-5 to reduce to low L-16, while the actual simulation execution risk control, average risk rating also reduce to low L-15. The performance is significantly.