Idiopathic scoliosis is the most common type of scoliosis in adolescents. This is an exclusive diagnosis. The natural course of idiopathic scoliosis varies greatly among patients, depending on the age of onset, age at menarche, curvature, scoliosis Cobb angle, and bone maturity. These factors determine the risk of progression of scoliosis in AIS patients. Scoliosis appears as complex three-dimensional deformities on the coronal, sagittal, and axial planes. There are several classification systems for idiopathic scoliosis. The Lenke classification is currently the most commonly used classification. The Lenke classification has three main components: curved, lumbar correction, and sagittal correction. This new classification system aims to define all types of deformities. Using Lenke classification to classify spinal deformities, four types of X-rays are indispensable: standing coronal and sagittal X-rays and left and right flexion X-rays. This classification divides scoliosis into 6 types, and uses waist correction and sagittal correction to further subdivide them. Therefore, the Lenke classification provides a reliable classification method for idiopathic scoliosis and also proposes corresponding treatment strategies.