Children with malunion of thigh fractures have symptoms such as angular deformity of the thigh, shortening of the affected limb, pain, and abnormal movement. Malunion is a fracture that has not healed properly according to its anatomical structure. It may be due to poor repositioning of the fracture, insecure fixation, or rapid removal of the fixation, pulling of the broken end by the muscles, or inappropriate weight-bearing of the limb. Abnormal healing such as shortening, rotation or angulation of the fracture can occur, leading to complications such as pain and limited range of motion. If the impact on function is not significant, it can be treated with observation and follow-up. When the deformity is too pronounced and affects the function of the limb, correction is needed and surgery is required if necessary. Children with thigh fracture deformity healing, specific should go to the hospital for examination to determine the degree of deformity. Treatment according to the doctor’s advice.