Zhu De-Zhi is a student of Wang Yang-Ming, the Ming Dynasty scholar. The academic thoughts of Zhu De-Zhi are inherited from Wang Yang-Ming's doctrine. He had well studied Zhongyong, and wrote three works: Laozi Tongyi (A General Study of Laozi), Leizi Tongyi (A General Study of Leizi) and Zhuangzi Tongyi (A General Study of Zhuangzi). Zhu De-Zhi eventually finished the work about researching Taoist as his academic achievement, though he is Wang Yang-Ming's student. This circumstance could be the proof that Yang-Ming doctrine is similar to the Taoist doctrine. Starting from Laozi Tongyi and also refer to Leizi Tongyi and Zhuangzi Tongyi, this essay includes the analysis why Zhu De-Zhi was interested in Taoism and why Zhu De-Zhi wrote Laozi Tongyi. Furthermore, we attempt to discover how Zhu De-Zhi reorganized Laozi doctrine in order to explain Yang-Ming doctrine. Through above process, we are trying to expound the Taoist doctrine research of Zhu De-Zhi which has any positive meaning about supplement or inspiration in Ming Dynasty's academic environment