Constipation generally does not affect embryo implantation, constipation is formed by a number of factors, the common factors are as follows: 1, eating a small amount of food, eating food lack of fiber. 2, work tension, fast pace of life, mental factors and other circumstances inhibit the intention to stool. 3, less activity, slow peristalsis of the intestinal tract. 4, perianorectal diseases, such as combining hemorrhoids, perianal abscess, fissure, and other diseases, the pain in the anus when defecation and cause constipation.5. Benign and malignant tumors of the colorectum.6. Drug factors. When pregnant, due to the influence of progesterone, it is more likely to have constipation. For the sake of the health of pregnant women and fetuses, it is more important to treat constipation in a systematic and standardized way during pregnancy and before pregnancy, so as to provide a good guarantee for the birth of a healthy baby.