This report investigates the adoption of ISO 9000 standards and its correlation with firm performance within China's service industry, utilizing data from the National Bureau of Statistics of China. It explores the impact of ISO 9000 certification on key performance indicators such as revenue, operational profit, return on sales (ROS), and return on assets (ROA). The analysis involves descriptive and inferential statistical methods, including t-tests and ANOVA, to test hypotheses related to the benefits of ISO 9000 adoption. The literature review provides context from previous studies, highlighting the importance of quality management systems and the potential for improved operational and financial outcomes. The findings suggest that ISO 9000 certification can positively influence firm performance, particularly in revenue and profit, while the impact on ROS and ROA may be less pronounced.