When calcium deficiency occurs in the third trimester of pregnancy, pregnant women can take calcium supplementation through general treatment and medication. 1. General treatment: Pregnant women should pay attention to rest during pregnancy, eat more calcium-rich foods, such as seafood, soy products, dairy products, etc., to supplement calcium through food, pregnant women should also carry out outdoor exercise, appropriate sun exposure, to promote the absorption of calcium ions. 2. medication: pregnant women in the third trimester of pregnancy calcium deficiency, can be under the guidance of the doctor to take calcium supplements, such as calcium carbonate, calcium gluconate, Vitamin D dihydrogen phosphate tablets, etc., but also should be appropriate supplementation of vitamin D, in order to promote calcium absorption. It is recommended that pregnant women strictly follow the doctor’s instructions to use medication, do not change the dose of drugs or private abuse of drugs, in order to avoid adverse reactions, in life should pay attention to rest, avoid strenuous exercise, strengthen nutrition, on time pregnancy checkups and so on.