Postpartum constipation and pelvic floor muscles have a certain relationship. Pelvic floor muscle is divided into upper, middle and lower 3 layers including the upper layer including the anorectalis muscle and caudal muscle, there is organ support and switch the dual role of the urethra, vagina and anus, which the anal sphincter system, is very important for the control of defecation. During pregnancy, due to the increased pressure in the pelvic cavity and the enormous pressure on the pelvic floor muscles during vaginal delivery, the relaxation of the pelvic floor muscles can easily occur. Pelvic floor muscle relaxation will be manifested as weak anal contraction and weak bowel movement, resulting in constipation. If the pelvic floor muscle relaxation leads to long-term constipation, it is necessary to consult the hospital in time, and under the guidance of the doctor to carry out treatment or rehabilitation exercises.