Biodegradable medical device which can be completely degraded and disappear after the healing of human body tissues would avoid a second surgical procedure to remove the temporary parts for fixation.Zn ion is a vital nutrient and anti-inflammatory factor for life.Zn ion can be absorbed and have no poisonous side effects during degradation of the Zn-based alloys.And zinc is widely acknowledged Biodegradable medical device which can be completely degraded and disappear after the healing of human body bodies would avoid a second surgical procedure to remove the temporary parts for fixation. Zn ion is a vital nutrient and anti-inflammatory factor for life. and have no poisonous side effects during degradation of the Zn-based alloys. And zinc is widely recognized