The lumbar disc herniation can be typed according to the location 1, according to the location of the disc herniation typing: ① unilateral type: this type of patients account for the absolute majority; ② bilateral type: the herniation occurs on both sides of the same gap, the patient alternately has symptoms in both lower limbs, and later develops into both limbs have symptoms, but no cauda equina nerve compression symptoms; ③ central type: the herniation is in the center, directly compressing the cauda equina nerve, the patient appears urinary and fecal abnormalities and numbness in the saddle area. 2. According to the location of the herniation and the spinal canal (cross-section), it is divided into central type, posterior lateral type, intraforaminal type (or lateral type) and extraforaminal type (or extreme lateral type). The first two types are common, accounting for about 85%, and the latter two types are rare and occur at the level of lumbar 3 to 4 and lumbar 4 to 5. 3.According to the relationship between the herniated disc and the nerve root, it is divided into supra-shoulder type, pre-shoulder type and axillary type. Supra-shoulder type: the herniated disc is located on the lateral side of the nerve root; pre-shoulder type: the herniated disc is located on the ventral side of the nerve root, pushing the nerve root to the posterior; subaxillary type: the herniated disc is located between the dural sac and the nerve root, and the nerve root is compressed and deformed by upward tortuosity.