Papillary thyroid cancer belongs to differentiated thyroid cancer, for this type of thyroid cancer, iodine 131 treatment should be carried out to consolidate the treatment effect. Thyroid cancer is divided into 4 stages, namely papillary carcinoma, follicular adenocarcinoma, medullary carcinoma and undifferentiated carcinoma. Among them, papillary carcinoma and follicular adenocarcinoma belong to differentiated thyroid cancer. Because thyroid tissue and differentiated thyroid cancer cells have the ability to take up iodine 131, thyroid cancer cells and residual thyroid tissue can be destroyed by iodine 131-emitting beta radiation. For differentiated thyroid cancer, postoperative residual thyroid tissue, iodine 131 uptake rate greater than 1%, and thyroid tissue imaging with the visualization of residual thyroid tissue are several cases that require iodine 131 treatment. Therefore, iodine 131 treatment is needed for papillary thyroid cancer hemisection. Patients are recommended to go to regular hospitals for standardized treatment.