Elements concerned with complications after operation and follow-up: according to classification, complication rates of middle hypospadias were 13% - 12, 9% and of posterior hypospadias were 17, 8% - 26%; to techniques, complication rates of onlay flaps were 11, 2% - 10% and of tube flaps were 21, 8% - 34, 5%; and to ages, complication rates of under 2 years old group were 0% - 0% and of above 2 years group were 16, 9% - 21, 7%.