Unsuccessful endometrial transformation during IVF transplantation may be caused by luteal insufficiency, abortion surgery, early onset ovarian insufficiency and so on. 1. Luteal insufficiency: luteal insufficiency may be caused by poor development of the follicle itself, follicular growth disorder, endometriosis and other factors. Patients will show unsuccessful endometrial transformation during ultrasound examination after IVF transplantation. 2. Induced abortion surgery: if a woman has undergone induced abortion surgery, it may lead to endometrial thinning, and the patient will have unsuccessful endometrial transformation during ultrasound examination after IVF transplantation. 3. Early onset ovarian insufficiency: Early onset ovarian insufficiency may be caused by chromosomal abnormality, heredity, or medical damage to the ovaries. Patients with premature ovarian insufficiency will have unsuccessful endothelial transformation after IVF transplantation. It is recommended that women who have unsuccessful endothelial transformation after IVF transplantation need to go to the hospital in time for examination and follow the doctor’s instructions for treatment.