Endometrial ABC usually refers to the different morphology of the endometrium in different states. It is the classification of endometrium into A, B and C. Generally, endometrial ultrasound examination shows B or C type. With the change of menstrual cycle and uterine position will affect the endometrial typing, generally the endometrial typing can be seen through ultrasound examination.1. Type A: If ultrasound shows endometrium as type A, it is the normal form of endometrium after menstruation and before ovulation, when the endometrium is in proliferative phase and follicular phase, which belongs to the 6th-10th day of menstrual cycle, the thickness of endometrium can grow to 4-9mm.Through ultrasound examination, it can be The endometrium is divided into three parts, between the outer layer of the endometrium and the midline of the uterine cavity is a hypoechoic zone, and outside the outer layer of the endometrium and the midline of the uterine cavity is a strong echogenic zone. or in the middle of ovulation, and the thickness of the endometrium is thicker, having increased to 9-12mm, and may be in the 11th day of the menstrual cycle to the day of ovulation. The endometrium is moderately echogenic and the midline of the uterine cavity is strongly echogenic but incoherent. At this time, the endometrium is better, which is conducive to the fertilization of the egg and has a higher conception rate; 3. Type C: If the ultrasound shows that the endometrium is type C, it is the morphology of the endometrium after ovulation, mostly seen in the luteal phase, and the thickness of the endometrium is usually 10-14 mm. At this time, the endometrium is strongly The endometrium is mainly affected by the progesterone secreted by the corpus luteum. Although the endometrium is still under the influence of estrogen, the conception rate of intercourse is not high during this period, which is not conducive to the fertilization of the egg. If the ultrasound results do not match the physiological period, it is recommended that further examination be done under the guidance of a doctor if it is related to multiple abortions or endocrine disorders. Women should take care of their uterus in their daily life, and if they do not need to conceive, they should take good protective measures during intercourse to avoid affecting the thickness of the uterine lining when having an abortion after pregnancy, which may affect the need to conceive later.