Pregnant patients with hyperthyroidism can be treated with propylthiouracil or methimazole as prescribed by the doctor. The most commonly used drugs for hyperthyroidism are methimazole, propylthiouracil, etc. In general, propylthiouracil reduces the conversion of T4 to T3 in peripheral tissues by inhibiting the activity of the 5’deiodinase enzyme, but the hepatotoxicity is greater than that of methimazole, so except for severe cases, thyroid crisis, early pregnancy or allergy to methimazole, propylthiouracil is preferred, methimazole is listed as the first choice for all other cases. It should be noted that the peripheral blood of the peripheral bloodstream is not as strong as that of the peripheral blood. It should be noted that peripheral blood leukocyte count <3.0×10*9 / L or allergic reaction to this type of drug is prohibited. Pregnant patients with hyperthyroidism who need to use medication should go to the hospital, consult a specialized doctor and choose the most appropriate anti-thyroid medication.