From the perspective of the anatomical structure of the human pelvic floor, the female vaginal cavity is mainly composed of sphincter and related ligament tissue. When a woman gives birth, the pelvis opens and the fetus is born from the birth canal, which will cause the sphincter muscles around the vagina to develop. Tears and injuries. The damaged sphincter after childbirth cannot be effectively restored, resulting in weak sphincter strength around the vagina, which in turn increases the vaginal cavity and relaxes the vulvar opening. Long-term vaginal relaxation is prone to infection with various types of bacteria, leading to some gynecological diseases. At the same time, vaginal laxity will also cause low quality of sexual life, and there will also be problems with front and rear wall bulging. Currently, vaginal laxity can be improved and treated through surgery or exercise. Minimally invasive surgery - 3D bio-banding private tightening surgery is mainly used for patients with mild to moderate laxity, mainly for tightening the vaginal cavity and vulvar opening. The 3D biological band private tightening surgery method mainly implants a biological band of sub-regenerative tissue on the vaginal posterior wall sphincter and vulva orifice to build a ligament for the loose sphincter and vulvar orifice to restore the elasticity of the sphincter and enhance the strength of the muscles. Thereby achieving effective vaginal tightening. If the laxity is severe or above, traditional posterior wall tightening surgery can be used for tightening.