Dhyāna, which has already existed in ancient India as a method to keep in good health and for deliverance, is looked upon as an important way leading to salvation by many sects. The course of dhyāna gives rise to supernatural powers, which was accounted for in all kinds of religious classics. How do these inconceivable supernatural powers come into existence? How do the classics expound these supernatural phenomena? We will make a deep survey to uncover its mystical veil. A comparison of the supernatural powers between Buddhism and yoga sect will reveal their right attitude to them, which would be a reference for the dhyāna practices'.