The thickness of the endometrium is one of the most important factors affecting embryo implantation. There is no so-called gold standard, and an endometrium of about 0.8cm to 1.4cm is eligible for embryo transfer or intercourse. Generally speaking, the endometrium is the layer that makes up the inner wall of the uterus, the mucous membrane that covers the uterine cavity. It is one of the most differentiated tissues in the body, and its role is to form menstruation when you are not pregnant and to proliferate rapidly when you are pregnant to provide nutrition for embryonic growth and development. The thickness of the normal endometrium varies with the menstrual cycle and is not constant. The endometrium is divided into a basal layer and a functional layer. The basal layer is not affected by ovarian hormonal changes during the menstrual cycle and is not shed during menstruation; the functional layer is affected by ovarian hormones showing cyclic changes and is necrotic and shed during menstruation. Therefore, the thickness of the endometrium is not a fixed value, it shows cyclic changes with the menstrual cycle. According to the menstrual cycle, the endometrium is also changing. Don’t worry if the condition is not met in one examination, after conditioning and treatment, most of them can reach the situation of conception. Pay attention to relaxation, reasonable diet, regular rest and regular check-ups.