Abstract: Research achievements about Hanfeizi's thoughts during Tang and Song Dynasties took critic as the main form, and the amount of research achievements about Hanfeizi and his thoughts was imbalanced, more in Song Dynasties. All of the research achievements were reflected in the following three aspects: (1) Official attitudes towards Hanfeizi's thoughts in Tang Dynasty were negative, but in Song Dynasty they were not clear, and mostly affected by Wang Anshi; (2) Value attitudes towards Hanfeizi's thoughts in Tang Dynasty were not clear, and in Song Dynasty they were influenced by Neo-Confucian; (3) The main topics about Hanfeizi's thoughts were influenced by Sima Qian and he was taken as a yardstick of negative value to judge historical issues.