“Open the Holy Gate” was an important way of cultivation in the ancient Taoism, and it was also the proof of achieving the immortal hood. Especially in Tang and Song dynasty, the popular Taoist “Internal Alchemy Sect” completely developed the way of cultivation to the best. In later Ming and Ching dynasty, Taoism seemed more unpopular; however, the immortal study of life of the “Holy Gate” achieved the successful transformation, and succeeded to the folk Religion. Seriously speaking, the elaboration of “Holy Gate” from folk religion was quite different with original Taoism. Nevertheless, it might be a reasonable phenomenon for transformation, and this article is to discuss the phenomenon. At first, the article is to analyze the origin and the development of the “Holy Gate”. Then, it discusses the pick and transformation of the Taoist “Holy Gate” for folk religions from two perspectives. One is the initiation ceremony of folk religions, and the other is the doctrine of the salvation of the folk religion. Also, the article uses it to prove the academic sayings about Taoism transformed into folk religion that in Ming and Ching dynasty.