We analysed three cases, repectively. The first case was chronic uncontrolled infected nonunion of femur due to open type III fracture which had been operated unsuccessfully at least 5 times. The second case was a infected nonunion and shortening of leg due to infecton of soft tissue surgery and then after knee arthrodesis. The third case was result from the total knee arthroplasty failure and then after knee arthrodesis. Ilizarov instrument was applied to this case for the knee joint arthrodesis. All cases showed bony union after average 14.6 months. The exact bony lengthening in the two cases after treatment was 11cm and 13cm and the healing index was 49.Odays/cm and 50.8days/cm The complications included the pin tract infection in all three cases and pin breakage in 2 of the cases. We achieved bony lengthening and bony union with relief of infection in 3 cases of chronic uncontrolled infected nonunion of femur treated with extensive saucerizaton and fixation using the Ilizarov instrument. These are the results of our treatment of chroic uncontrolled infected nonunion of femur using the Ilizarov instrument.