Abstract: By analysing nuclide image characteristics and radioimmunoassay data of 61 cases with Hashimoto's thyroiditis (HT), HT can be classified five types as below:uneven distribution, diffusion, with hyperfunction, with nodules, nearly normal. The results of radionuclide imaging and the radioimmunoassay of all the types indicate that HT can be preliminarily diagnosed by conscientiously analysing nuclide image characteristics and radioimmunoassay data and linking clinical symptoms and signs.