Objective To discuss the influence of age factor on the outcome of the treatment of solitary bone cyst by Depo-Medrol infiltration. Methods 24 cases with Solitary Bone Cyst were analyzed. Age ranged from 4 to 23 years old,mean 10.8. Female 9 cases,male 15 cases. Humerus 18 cases,femur 2,tibia and fibula 2,radius and ulna 1, pelvis 1.16 cases(66.6%)Solitary Bone Cyst at proximal,7 cases(29.2%)at distal,1 (4.2%)at medio. 16 cases (66.6%)on the right,8 cases(33.4% )on the left. All cases were treated with Depo-Medrol infiltration. Mean follow up period was 4.5 years; review every case's result by the X-ray and clinical signs and symptoms. Results Group A 8 cases (33.4%) healed, Group B 9 cases (37.5%) healed. There was no significant difference in the healing rate be-tween Group A and B (P=0.653). Conclusions We conclude that the healing rate can not affected by age (P=0.653). In our opinion,the origin of Solitary Bone Cyst is disturbance of bone growth on physis,so we suggest the in-sertion point of inject needles close to the physis and sufficient to touch the physis.