OBJECTIVE: To study the value of the fine needle aspirationin cytological examination for child thyroiditis. METHODS: The fine needle aspiration was performed in cytological examination for 100 patients with child thyroiditis. RESULTS: In 98 patients (98%) the clinical treatment coincided with other laboratory examinations. Two patients (2%) were misdiagnosed by typing. The sensitivity of serology (T 3, T 4, TG, TM, TSH) examination was lower. The hashimoto's thyroiditis diagnostic rate was 63.1% ～ 73.6% , lymphocytic thyroiditis was 26.0% ～ 84.7% , and other serological examinations showed no significance. CONCLUSIONS: The fine needle aspiration can obtain enough tissues for diagnosis.