If peritoneal invasion is seen in thyroid surgery but lymph nodes have not metastasized, clinical treatment can be achieved through early diagnosis and early treatment, which cannot be cured if the disease is delayed. If the cancer cells invade the peritoneum but have not metastasized or spread to the distal end, generally, follow-up treatments such as iodine 131 are needed after surgery. After regular treatment, the condition of most patients will be controlled and clinical cure can be achieved, and the survival rate will be appropriately prolonged if the patients have a good mindset. If the peritoneum is found to have been violated after surgery, without regular treatment, the survival rate of patients will be significantly reduced after the disease progresses, and clinical cure cannot be achieved. Moreover, some patients have a poor state of mind, the disease can not be controlled, and the death rate will increase. If peritoneal invasion is detected after thyroid surgery, patients should undergo regular review and choose the best treatment to control the progression of the disease and prolong the survival rate according to the guidance of professional doctors.