To study on the effect of bone powder outside the application assisted percutaneous K-wire fixation of unstable distal radius fractures.Methods:We selected 80 cases of unstable fracture of the distal radius in children as the object of study,from 2011 May to 2014 May in our hospital,were randomly divided into control group and observation group,each group of 40 cases.Control group：using Kirschner wire internal fixation.The observation group:using Kirschner wire internal fixation，fracture healingpowder treatment.To observe and compare the clinical efficacy，wound healing time and the incidence of adverse reactions of two groups of children with fracture.Results:The excellent and good rate was 95% in the observation group more than 72.5% that of control group,the difference was statistically significant(P<0.01).Fracture healing time，observation group was shorter than the control group,the difference was statistically significant(P<0.01).The incidence of adverse reactions,no statistically significant difference between the two groups(P>0.05).Conclusion:Bone powder outside application assisted percutaneous Kirschner wire fixation for the treatment of unstable fracture of the distal radius，good clinical effect,can effectively shorten the healing time and no serious adverse reactions，it is worthy of clinical reference.