Investigators evaluate all women's operation method, operation time, bleed volume, overactive bladder questionnaire, PFDI-20，ICIQ-SF, I-QoL, PISQ-12, PFIQ-7, UDI-6, pre- and post-operation (at 1 month, 3 months, 6months and 1 year).
The study is a prospective study at a single institution. Investigators create strict inclusion and exclusion criteria, selecting 124 patients with POP(≥II degree and have symptoms that need operation) . 62 patients in the intervention group accept extraperitoneal high uterosacral ligament suspension. The other 62 patients in the other group accept sacrospinous ligament suspension.