This study was a prospective follow-up study of newly diagnosed and relapsed Graves' disease patients in the Endocrinology Clinic of the First Affiliated Hospital of China Medical University. The following aspects will be studied: 1. Through the prospective follow-up study of GD patients, we will get the relapse rate and remission rate of GD patients treated with drugs, explore the risk factors of GD patients relapsing after drug treatment, and make GD relapse risk prediction software; 2. To compare the effects of high dose and low dose methimazole on the remission rate, liver side effects, leukopenia and other adverse drug reactions, and to summarize the incidence and risk factors of liver side effects, leukopenia and other adverse drug reactions caused by drug treatment; 3. To investigate the sensitivity and specificity of TRAb in the diagnosis of GD in China and its role in predicting recurrence; 4. After taking ATD, the serum alkaline phosphatase of GD patients will increase first and then decrease. This study will focus on analyzing the dynamic changes of this index before and after methimazole treatment, and analyze the relationship between it and thyroid function index.