OBJECTIVE: To review and summarize the experience of applying the U-shaped nail method for the correction of lower limb inequalities and angular deformities in children from 1989 to 2007 at Beijing Children’s Hospital. METHODS: For angular deformities of the lower limbs and limb inequality due to limb overgrowth, we used the U-shaped nail method (also known as the Blount temporary epiphyseal blocking nail technique). All are placed subcutaneously. If the therapeutic effect was achieved, it was removed immediately. If the therapeutic purpose was not achieved temporarily, the U-shaped nail needed to be temporarily removed about one year after placement and reinserted after 3 months to avoid damage to the epiphysis. RESULTS: A total of 16 children were treated with the temporary epiphyseal block technique. 1 case of congenital unilateral limb overgrowth, 1 case of neurofibromatosis combined with unilateral limb overgrowth, 2 cases of K-T syndrome, 2 cases of Proteus syndrome, 4 cases of severe bilateral knee valgus, 1 case of endogenous osteochondroma combined with knee valgus deformity, 2 cases of knee valgus due to premature epiphyseal closure, 1 case of epiphyseal dysplasia combined with knee Two cases of U-shaped nail dislodgement without fracture, one case of deformation of the epiphysis, and one case of cartilage-like tissue hyperplasia at the nail placement site. Conclusion: Children before epiphysis closure have growth potential, and children who suffer from limb overgrowth resulting in limb inequality and angular deformity of lower limbs due to different reasons can be treated with temporary epiphyseal blocking technique, which can be adjusted automatically by their own growth and development capacity. This method has the advantages of being less invasive, minimally invasive, relatively simple and effective. However, the number of nails to be placed, their position, and the duration of maintenance in vivo need to be further observed and studied.