The endometrial lining of the uterus is only 0.7cm at the time of ovulation, which is an anomaly. The endometrial lining of the uterus should be at least 0.9cm at the time of ovulation to make it possible for the fertilized ovum to attach to the uterus in order to conceive a baby. To find out the cause, the following reasons are common: 1, the endometrial lining is thin due to estrogen insufficiency, it is recommended to supplement estrogen. 2, the endometrial lining is thin due to incomplete adhesion in the uterine cavity caused by a history of uterine operation, it is necessary to do hysteroscopy, if there is adhesion, the adhesion tissue will be separated, and then put on the IUD to prevent re-adhesion, and oral supplemental Jiale for 3 months in order to make the endometrial lining back to normal. Normalize the endometrial lining. When the endometrial lining is thin during ovulation, it is important to find out the cause and treat it promptly.