From　the　three　basic　character　of　the　computer　security:　confidentiality,　integrity,　availability,　the　paper　studies　the　Bell-Lapadula　confidentiality　model,　the　Biba　integrity　model,　the　Clark-Wilson　integrity　model　and　Chinese　wall　Model.　This　paper　also　studies　the　relation　among　three　models　of　the　Bell-　Lapadula　model,　the　Biba　model　and　he　Clark-Wilson　model,　studies　the　relation　and　distinguishes　between　the　Bell-Lapadula　model　and　the　China　Wall　model　from　the　point　of　the　information　security.　©　2010　IEEE.