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lock has not only practical value, but also become a precious historical evidence. it reflects the historical development track of woodworking technology and hardware technology from one side. lock from its material, modeling design, mechanical structure, organ structure, carving painting and calligraphy aspects, it involves many disciplines, woodworking technology, smelting casting, forging cold work, art painting and calligraphy, copper and wood carving, as well as power, physics, geometry, psychology and other disciplines, can find traces in locks, which reflect the social, political, economic, cultural, living customs and other aspects of the past dynasties. through the invention, creation and improvement of several generations of skillful craftsmen, the locks produced can be said to be hundreds of millions of megabytes, and it is difficult to count accurate figures. from the handed-down locks, there are many fine products among them, which are the crystallization of the wisdom of ancient craftsmen. it may be because the lock itself is a kind of object that reflects confidentiality. locksmiths have been passed down from generation to generation, and literati who wrote books and wrote books are rarely involved, resulting in few records of historical classics, official history and wild history, so far, side lock art research is almost blank. in traditional china, people regard happiness as one of the "five blessings", thus we can know the emphasis on happiness.