ISO17025 is the international standard for laboratory accreditation services; the latest version is released in May, 2005. The full name of ISO/IEC17025:2005-5-15 is Accreditation Criteria for the Competence of Testing and Calibration Laboratories. ISO17025 standard is the laboratory management standard formulated by the international Standardization Organization ISO/CASCO (Conformity Assessment Committee). Internationally the organization that manages laboratory accreditation is International Laboratory Accreditation Cooperation (ILAC), attended by 44 laboratory accreditation institute including CHINA NATIONAL ACCREDITATION COMMITTEE FOR LABORATORIES (CNACL). ISO17025 standard mainly includes: definitions, organization and management, quality system, audits and reviews, personnel, accommodation and environmental conditions, equipment and reference materials, traceability and calibration, calibration and test methods, sample management, record, certificate and report, subcontracti...