Current factory's automated production lines have strict quality requirements. With small and diverse orders and tight delivery time, the manufacturing managers need to improve quickly the quality and yield of factory products, keep delivery on time, and maintain high production efficiency and proper inventory levels to remain the competitiveness of the enterprise. Therefore, the integration and effect of Manufacturing Execution System (MES) are more important. This article gives an in-depth and complete introduction to the possible architecture of the intelligent manufacturing execution system and the benefits of process optimization technology in the machining process.