Abstract: 139 cases of carcinoma of the thyroid were analyzed, of 139 cases, 119 cases were papillary carcinoma, 7 cases were follicular carcinoma, 4 cases were medullary carcinoma, 9 cases were undifferentiated carcinoma. The helpful diagnostic feature of papillary carcinoma is ground-glass nuclei. We must be deliberation in diagnosis follicular carcinoma. Because of the cIinic mis-diagnosis of carcinoma of the thyroid is as high as 77%, it is better to perform a needle biopsy prior the opration.