Objective　To investigate the fixation of humeral fractures by olecranon osteotomy and "Y"-shaped locking plate as well as the clinical efficacy of this approach.　Methods　Form December 2009 to December 2011, 30 cases of adult type "C" humeral condylar fracture, were selected for treatment by olecranon osteotomy and "Y"-shaped locking plate fixation. The patients included 18 males and 12 females, whose age ranged from 18 to 50 years, with average of (38.6±7.8) years old. Mayo elbow performance scoring was used for post-operative efficacy evaluation.　Results　The patients were followed up for 12 to 18 months. Bone healing, taking an average of (3.0±0.6) months, was achieved in humerus fractures and olecranon osteotomy. The efficacy evaluation scored 50 to 100 by Myo performance scoring system, with an average of 87 points, The efficacy was excellent in 24 cases, good in 1 case, mediocre in 3 cases and poor in 2 cases. The good rate was 83.3%.　Conclusion　The fixation of humeral condylar fracture by olecranon osteotomy and "Y"-shaped locking plate has such advantages as a clear operative field, internal rigid fixation, and enabling for early functional elbow exercises. The clinical results were satisfactory.