The basic proposition of Plato's theory of life and death is that ”death releases the soul from the body”. His philosophy of life and death is discussed mainly in the writings of ”Phaedo”, ”Meno”, ”Republic”, ”Timaeous”, ”Phaedrus”, ”Sophist”, ”Laws”, etc. The ”immortality of the soul” mentioned in ”Phaedo” originates from the development of Pythagoras' philosophy of death. ”Phaedo” demonstrates the idea through ancient legend of rebirth, the theory of recollection, the imperishable soul and the ideas. Hence, it reveals the kind of detached position on death that a philosopher should take, and further emphasizes the significance of philosophy in the study of death.