Bracelets are used as amulets. Engels pointed out: "In ancient times, people didn't know their body structure at all. They were influenced by dreams, so there was an idea that their thoughts and feelings were not physical activities, but a unique activity in the soul. The soul lived in this body and left this body when it died." Primitive people think that everything has a soul, and the soul can be divided into good and evil. It is the good spirit that brings happiness and joy to mankind, but the evil spirit that brings disaster and disease on the contrary. Primitive people put things like shells, pebbles, feathers, animal teeth, leaves and fruits on their bodies with ropes in order to keep evil spirits away and get protection from good spirits. They believe that these things have a supernatural power invisible to human eyes. With it, people can be blessed and evil will be driven away. These things, which played the role of protection and exorcism, later became a special kind of jewelry and appeared on the human body in a decorative shape. Moreover, this custom and significance have been preserved, and jewelry has been endowed with more beautiful sustenance and mysterious colors by human beings.