Zhang Ju-zheng had a profound understanding and accurate exposition of Chinese Buddhism, Confucianism and Daoism; moreover, Chan formed an important part of his thought. Zhang Ju-zheng's Chan ideology received influences from his family and was conditioned in the historical, cultural and social contexts, especially under the impact of Wang Yang-ming's School of Mind. Chan deeply affected Zhang Ju-zheng's political personality and ability of reflection. Chan provided him an important ideological resource for resisting dominant Confucian ideology and to promote political reform. This paper concludes by an analysis of Zhang Ju-zheng's Buddhism policy, examining his political ideal of religious tolerance as a politician with full understanding of religion. The phenomenon of Zhang Ju-zheng provides an example of how Buddhism influences human political life, which is a model of Humanistic Buddhism in ancient time.