Liang Su was a brilliant personage respected and admired by Confucian scholars in the Dali and Zhenyuan periods, during the reign of the Tang emperor Daizong and Dezong. The purpose of this paper is to discuss the characteristics of Liang Su’s belief of Buddhism in this time. The author holds, that Liang Su’s principle of respecting scriptural learning is his consistent stand of the perspectives about Confucianism and Buddhism, which is actually the product of the nat ions and Buddhism in peril during the Dali and Zhenyuan periods. A manifestation of Liang Su laying stress on Buddhist argumentation is researching and applying the Metaphysical Meanings of Vimalakirtinirdesa sutra which is the Tiantai Sect’s detailed re-explanation of Vimalakirtinirdesa sutra by Masters such as Zh Yi and Zhan Ran. All the Tiantai theories concerning “three aspects of contemplation contained in one single mind ”and “taking non-dwelling as the origin”,had an important influence on Liang Su’s thinking about his writing or the way that he complied with the mundane world. As the result, it made Liang Su an advocater and a refined man beyond worldly life in propagating Confucianism and creating work, and set a shining example of lay Buddhist in all the other intellectuals.