Abstract: This article analyzes the 1003 thyroid single node cases treated surgically，concluding: 1. The occurence ratio of thyroid cancer is high in thyroid single node. 2. Apparently the occurence ratio of thyroid cancer in thyroid single node is larger in male than in female (P<0. 0l). 3. In solid thy-roid single node thyroid cancer occurs obviously more often than in sac node (P<0. 0l). 4. Such cancey occurs more easily among those less than 45 years old than those over 45 years old (PG 0. 0l).5. With high ratio of misdiagnosis. The misdiagnosis of thyroid cancer in this group reaches as much as 59. 3%So the gland lobe excision is available for a thyroid single node.