In today's rapidly changing business environment, companies must continuously optimize their internal processes to improve efficiency, reduce costs and increase customer satisfaction. Business Process Modeling Notation (BPMN) is a standardized graphical notation that helps companies to optimize their internal processes in different BPMN 2.0 is the latest version of BPMN, which has stronger expressiveness and flexibility, and provides a powerful tool for business process management. This article will use multiple BPMN templates from the ProcessOn template community to illustrate The concept, structure, symbol meaning and application scenarios of BPMN.