Through hundreds of projects and tens of thousands of data, we comprehensively and deeply analyzed the quality demands in consumer complaint data, explored the "Causes" and "Effects" of door and window quality problems, found ways to improve door and window quality from the problems, summarized 6tips of door and window design quality control, key points of control purchasing door and window by bidding, and explored high-quality manufacturing technology, and also explored the door and window construction control rules and door and window project operation quality control flow chart of real estate developers. For reference and discussion of relevant people in the industry.