Although he always considered the thinking of Confucian school an orthodox one, as an all- round Confucian scholar of idealist philosophy of Song Dynasty, ZHU Xi also had a deep study into the thinking of Taoist school. This article analyzes ZHU Xi ' s thinking of Laoism from four aspects : the understanding and comment of "Lao Zi" ; LAO Zi and his elucidation; ZHU Xi' s philosophy and "Lao Zi", so as to emphasize the theoretical vigor of Laoism, and further make clear the important role of the thinking of...