Equinus deformity of ankle, adduction and flexion deformity of hip and flexion contracture of knee are most common deformities in spastic cerebral palsy. There were many surgical treatment methods according to its causes. Authors has analysed 115 patients(224 operation) who had been operated with three procedure (Modified Egger's op, Proximal hamstring elongation, Distal hamstring elongation) and compared the results of these procedure at Sam Yook Rehabilitation Center from Jan. 1980 to Dec. 1987. The following results are obtained: 1. The results of Modified Egger's operation were unsatisfied because of complicaLion and little angle correction ability of flexion contracture of knee joint. 2. Even though there was no differences in angle correction ability of flexion contracture of knee joint between two procedures, the results of proximal hamstring elongation were superior to them of distal elongtion because early walking ability is more easily improved.