This article provides a standardized and systematic simple factory audit (factory inspection) operation guide for third-party inspection personnel, covering 7 core phases, clear operation points, time allocation and evidence retention requirements, which can help inspection personnel to standardize the audit process, objectively assess the factory in terms of legitimacy, quality management, production operations, supply chain reliability and humane care level, identify potential risks, and provide professional references to customers. Provide professional reference for customers' cooperation decision.