Most patients with endometrial cancer have rich blood flow signal. Patients with endometrial cancer often show irregular vaginal bleeding, and most of them can see irregular occupancy in the uterine cavity during ultrasound examination. Generally, the blood flow signal is richer because the malignant tumor is growing rapidly and surrounded by richer tumor blood vessels, so the blood flow signal is richer and there is low resistance blood flow, that is, the resistance index RI is generally less than 0.4. For these patients, if they have irregular vaginal bleeding with intrauterine occupancy and abundant blood flow, they should be alerted to the possibility of malignant endometrial cancer and need to undergo segmental scraping or hysteroscopy if necessary to exclude the possibility of malignant tumor.