It is well recognized that the lengthening of the lower limb has been performed successfully after the introduction of the Ilizarov treatment. Ilizarov treatments for humerus fractures have many advantages and could lead to good results, if cases are to be selected properly according to the indications. The fractures of the humerus shaft are generally treated nonoperatively and good results could be achieved by conservative treatment such as suger tong splint, functional brace, and hanging arm cast. Open reduction and internal fixation is indicated in such cases in which conservative treatments were failed, or bed rest is needed because of associated injury, or the Holstein-Lewis syndrome was developed. In some cases of the humerus shaft fractures and distal humerus fractures, many advantages could be considered by the Ilizarov treatment in comparison with the conservative treatment or open reduction and internal fixation. The followings could be good indications for the Ilizarov treatment: If the open reduction and internal fixation is indicated but the bad skin and soft tissue condition could not allow the open reduction and internal fixation, or if the comminutions of the fracture are too severe and extensive for open reduction and internal fixation, the Ilizarov treatment is a good method of treatment for such cases. Authors performed Ilizarov treatment for 6 cases of the humerus fractures, and 1 case of nonunion of humerus fracture from August, 1990 to April, 1991. We report our experiences and results.