據慧思自著〈立誓願文〉，全面考證慧思同光山的關係。四十歲開始駐錫光山，先後在光州開嶽寺、觀邑寺、齊光寺，以及大蘇山弘揚佛法，西元567年，年逾知命，離光山南下湖湘南嶽，推動了天台思想的向南發展，以及天台宗的形成。後人于17年後在大蘇山勒石為記。進一步證明大蘇山是天台思想的發祥地。

In academia, although there is an agreement that Huisi established Tiantai Philosophy while living in the Big Su Mountain, so far there is still a lack of understanding of the Jingju Monastery. In this article, based on the historical literature and lapidarian record, the author demonstrated that the relationship among Huisi, Zhiyi and Jingju monastery from eight aspects of research. It is fully proved that the Big and Little Su Mountain is the origin of Tiantai Philosophy, whereas the Jingju Monastery is the birthplace of Tiantai Buddhism Sect earlier than Guoqing Monastery.