As a representation of “one should establish his own thought”, Zhang Zai’s “Zheng Meng” has the factors both criticizing Buddhism and Daoism, and both mending the neo-Confucianism in Song and Ming dynasties. Furthermore, from the point of view of the thinking situation of that time, there should be strong love of “working for Tao” for Philosophy in Song and Ming dynasties in the book. However, all the above are the social and historical conditions which Zhang Zhai has to write “Zheng Meng” . The book does not have the inevitability of the subject’s practice, but the inevitability of impersonal society and history. However, from the view point of the genetic theory of man, it is the differences between Zhang Zai and Wang Anshi about the “Qingli New Reform” and the opposition about the way of new reform, that are, in fact, the realistic reasons to write the book, and so of the subject’s practice of “Zheng Meng”. In his book of “Zheng Meng”, Zhang Zai’s discussion and experiment about the square-fields system, the advocation and practice of village contracts, is another experimental unit about “Qingli New Reform” different from Xining reform, as well as a systemic inquiry into the way to realize the long lasting peace of the world. As a representation of “one should establish his own thought”, Zhang Zai’s “Zheng Meng” has the factors both criticizing Buddhism and Daoism, and both both of the neo-Confucianism in Song and Ming dynasties. Furthermore, from the point of view of the thinking situation of that time, there should be strong love of “working for Tao” for Philosophy in Song and Ming dynasties in the book. However, all the above are the social and historical conditions which Zhang Zhai has to write “Zheng Meng”. The book does not have the inevitability of the subject’s practice, but the inevitability of impersonal society and history. However, from the view point of the genetic theory of man, it is the differences between Zhang Zai and Wang Anshi about the “Qingli New Reform ”And the opposition about the way of new reform, that are, in fact, the realistic reasons to write the book, and so of the subject’s practice of“ Zheng Meng. ”In his book of“ Zheng Meng ”, Zhang Zai’s discussion and experiment about the square-fields system, the advocation and practice of village contracts, is another experimental unit about “Qingli New Reform” different from Xining reform, as well as a systemic inquiry into the way to realize the long lasting peace of the world.