First, the size and shape of the thyroid gland; second, whether there are diffuse lesions inside the thyroid gland; third, whether there are nodules inside the thyroid gland and whether the size, shape, border and shape of the nodules are clear and regular; fourth, whether there are calcifications inside the thyroid nodules, the size of the calcification foci, and the blood flow around and inside the nodules. These are the things that can be detected by ultrasound examination of the thyroid gland, and they are also helpful in determining the benignity and malignancy of the nodules, and if combined with the functional examination of the thyroid gland, the judgment of thyroid disease will be more comprehensive.