Objective: To investigate the clinical efficacy and safety of osteotomy and subtalar joint preservation in the treatment of malunion of Stepens I calcaneal fracture, and to provide help for its treatment. Methods : from February 2013 to December 2016, 11 patients withsymptomatic Stephens I calcaneal fracture malunion who failed to conservative treatment were treated surgically. Lateral view, axial view X-ray and three-dimensional reconstruction of CT scan were performed preoperation. All patients were treated with osteotomy, the posterior articular surface of the subtalar joint was reduced and the lateral wall prominent were corrected, and the subtalar joint was preserved. B?hler’s angle were measured for radiographic evaluation; AOFAS score and VAS score were evaluated preoperation and at the last follow-up for clinic evaluation. Results: all the 11 cases were followed up at an average of 16.9 months (10-29 months). Nonunion, displacement of the internal fixation and severe traumatic arthritis were not found at the last follow-up；and no patient underwent revised operation for subtalar joint fusion. The mean healing time of osteotomy was 10.7 weeks (7 weeks to 13 weeks). The mean visual analog scale score improved from 4.36±1.45 beforere reconstruction to 0.73±0.62 at the last follow-up(p<0.05) .Mean American Orthopedic Foot& Ankle Society Ankle and Hindfoot score improved from 69.64±55.05 pre-reconstruction to 86.54±44.87 at the last follow-up( p <0.05). The mean B?hler’s angle improved from 16.64°±43.85° pre-operation to 30.55°±11.07° at the last follow-up (p< 0.05) .Conclusion: StephensⅠcalcaneal fracture malunion, for young and active patients who preferred to preserve the subtalar joint; osteotomy and preservation of the subtalar joint can effectively relief the pain,preserve the joint and reduce of adjacent joint stress, achieve good clinical outcomes.