ISO 20000 is an international standard for IT Service Management (ITSM) in the world. It is constructed based on ITIL® practices and the BS15000 British standard system, and was published by the ISO organization in December 2005. ISO 20000 defines a set of closely related service management processes, aiming to provide a model for establishing, implementing, operating, monitoring, reviewing, maintaining, and improving IT Service Management Systems (ITSM). This system adheres to the service philosophy of "customer-centricity and process orientation," aiming to help enterprise organizations effectively identify and manage the key processes of IT service management, ensuring that while meeting customer and business needs, the recognized "P-D-C-A" methodology is applied to fully leverage the continuous improvement capabilities of IT services, achieving the goal of obtaining large returns with small costs for the enterprise organization.