1. No matter from which aspect, the purpose of compiling the quality system is to ensure the product quality of the enterprise, because the purpose of compiling is also a summary of the quality policy of the enterprise. 2. The procedure is based on ISO900 1:2008: 2008, which corresponds to the requirements of the same industry one by one, and is truthfully stated in combination with the previous quality control measures of various departments, making it a model for all departments of this enterprise to implement. Every link, from staff training, raw material procurement, material warehousing, semi-finished product processing to finished product production, must have corresponding measures and the signature of the handlers to ensure that the quality is relatively traceable, that is, once there is a quality problem, it can be traced back to that link immediately, why there is a problem and how to correct it. 3. The key to internal auditors' learning problems is understanding. If you don't understand ISO900 1:2008: 2008 and the characteristics of this industry, you will feel like learning a book. Only a good understanding of the quality characteristics of the industry and the original quality management and quality control measures of enterprises can we learn well. If there is no ready-made, you will become easy to learn. Finally, I wish you success.