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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 take happiness as their favorite"one of the five blessings", from this we can see that the emphasis on happiness, chinese people's attitude towards life is generally very realistic, love life, pursue happiness and happiness. therefore, people regard many things as happiness. such as marriage, mid-lift, road encounter old times, relatives and visits, etc.