The aim of this prospective experimental study was to analyze the radiological and clinical results of the supra condylar fracture of Humerus in children and conducted the functional outcome of closed reduction and internal fixation by percutaneous Kirschner-wire from lateral side and crossed technique in the National Institute of Traumatology and Orthopaedic Rehabilitation (NITOR), Sher-E-Bangla Nagor, Dhaka, Bangladesh from July 2011 to June 2013. Patients diagnosed as closed Supracondylar fracture of Humerus in children due to trauma were the study population. Total 30 patients aged 2 to 12 years irrespective of sex were included in the study and were divided in 2 groups. Information obtained included age, sex, type of fracture, management, outcomes and complications. The mean age was 7.80±2.08 and 5.93±2.31 years for Group I and Group II patients. Age range was 2-12 years. Males were predominant 11(73.3%) Group I and Group II. Fractures were primarily caused by fall from tree and left side predominant. In Group I the time elapsed between injury and surgery was minimum 2 hours and maximum 24 hours with mean±SD was 9.20±7.20, while in Group II minimum and maximum of 3 and 48 hours respectively with mean±SD was 9.60±11.01. Minimum and maximum post operative hospital stays were 1 and 2 days in Group I and Group II. Follow-up were carried out after 1, 3, 6 and 12 weeks of operation. Loss of post operative range of motion of elbow and loss of carrying angle was not significant (p>0.05). Functional outcome was analyzed by Flynn's grading. In this study there were 3(20%) cases with excellent, 10(66.67%) were good and 2(13.33%) were fair functional outcomes in Group I. In Group II excellent, good and fair functional outcome were 3(20%), 9(60%) and 3(20%) respectively. After chi-square test there was no significant difference between two groups.