The main precautions for the preservation of fetus in pregnant women with cavernous hemorrhage include proper rest, improved diet, medication guidance, close monitoring and maintaining a good state of mind.1. Proper rest: During the acute period, pregnant women need to rest in bed, avoid strenuous exercise and prohibit sexual intercourse. Try to take the left-sided position when resting to avoid fetal ischemia and hypoxia caused by supine hypotension syndrome. In addition, it is also possible to use the healthy-side position for blood accumulation in the uterine cavity, which is conducive to adequate drainage and avoid increasing the pressure in the uterine cavity leading to an increase in the amount of accumulated blood; 2. Improve diet: pregnant women can consume iron-rich foods, such as animal liver and lean meat foods, to correct blood loss anemia. At the same time, pay attention to the appropriate amount of fresh vegetables and fruits, avoid spicy and greasy food, and keep the bowel movement smooth to avoid constipation leading to increased abdominal pressure, which in turn causes increased bleeding; 3. Guidance on medication: usually early accumulation of blood in the uterine cavity does not appear vaginal bleeding, and the accumulated blood may be absorbed by the mother with the growth of the pregnancy week. However, if the bleeding is more serious, it is necessary to take antiretroviral drugs, such as progesterone and drospirenone tablets, under the guidance of doctors. However, pregnant women should use the medication according to the doctor’s advice, do not blindly use the medication to increase the risk of miscarriage; 4. Close monitoring: pregnant women should closely observe the abdominal pain and the amount of vaginal bleeding during the period of fetal preservation, and regularly review the ultrasound to understand the changes of blood accumulation in the uterine cavity. If a pregnant woman has abdominal cramping and swelling pain that cannot be relieved after rest, vaginal drainage with partial discharge of tissue, abnormal increase in bleeding, etc., she should go to the hospital in time; 5. maintain a good attitude: some pregnant women may worry about the failure of birth control or high bleeding, which may cause anxiety and tension, but negative emotions can affect the success rate of birth control, so such pregnant women should relax and actively treat.