OHSAS18000标准
  The internal audit of occupational safety and health management system is an essential part of system operation. After a period of trial operation system, the organization shall meet the conditions for occupational safety and health management system test whether the occupational health and safety management system standard requirements, shall carry out internal audits. Occupational Health and Safety Management Representative should be personally organized internal audit. Internal Auditor should be trained expertise. If necessary, the organization may engage external experts to participate in or host review. Internal Auditor at the pre-trial documents, should focus on the integrity and judgment of system files, compliance and consistency; during field audits should focus on the applicability and effectiveness of the system function, the system checks whether the documentation requirements to operate .
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