Lions play an important role in Chinese mythology, and represent joy and happiness. Lion dances are performed to bring luck and to get rid of the devil. This tradition can betraced back to a story that took place long ago.
来源：考试大
　　During the rule of the legendary "Yellow Emperor", a monster called "Nien" appeared in China, attacking themen and the animals. It was so fast and fierce that neither the fox nor the tiger could beat it. In despair, the people asked the lion for help. The lion bravely rushed towards the monster and wounded it. The "Nien" fled, but declared to come back to take revenge. 来源：考试大

　　A year later, the "Nien" returned. Without the lion's protection this time, the people produced a "lion" out of bamboo and cloth. Two men crawled inside and approached the "Nien". The "lion" pranced and roared, driving the monster away again.来源：考试大

　　From then on, lion dances have become a yearly tradition to frighten evil away during the Chinese New Year.