Since ancient times, Tiantai Mountain in eastern Zhejiang has been regarded as a fairy mountain comparable to Penglai. The religious practices it has inspired have shaped its sacred spatial cultural image, making it a place where sages and immortals have longed to live and visit throughout history. In light of the current decline of its fairy mountains and sacred realms, and from the perspective of spatial research in the media sense of “human real to fairyland” connecting to Tiantai Mountain, using Sun Chuo’s Prose of Touring Tiantai Mountain as a reference, research has revealed that Tiantai Mountain has undergone a sacred geographical evolution. This evolution has transitioned from early imaginings of immortal mountains to the development of the Cavern of Heaven, ultimately leading to constructing a landscape sequence that connects the human world to the Cavern of Heaven. Under this profound influence, the construction of Tiantai Mountain Temple Hall has been distributed along core sacred geographical sequences such as “Chicheng, Waterfall - Tongbai - Qiongtai Double Que”, “Chicheng - Folong- Shiliang - Huading” and “Youxi - Lingxu - Huading”. The spatial form of “multi-line” has developed concurrently, guiding diverse “paths” to enter Tiantai Mountain. The aim is to provide theoretical support for the restoration, planning, and development of the sacred landscape of Tiantai Mountain by retrospectively exploring the historical causes of its sacred spatial form.