Bacchus (Florence, Bargello) is one of the main works executed by Michelangelo during his first stay in Rome. Based on his study of Michelangelo's works of sculpture, drawing and so on, the author analyses form and style of Bacchus and concludes as follows : (1) the work must have been based on the ancient statue of Bacchus ; (2) it also shows the result of his wide study of many ancient sculptural works in Rome (especially the statue of Hercules), (3) it has a character of pseudoclassical sensuality, common to the late Quattrocento works ; (4) in it skillfully is used form and style of his early works, such as Centauromachia, Hercules, Saint Spirit Crucifix, Sleeping Cupid, etc. And it is definitely classical. Thus it becomes clear that Bacchus shows the important turning point in his early development of style. Bacchus is also interpreted in the light of neo-platonism. It shows clearly sensual ecstatic mysteries, which reminded Vasari of androgynous characters. According to the author's opinion, Bacchus represents a prisoner of sensuality, whose facial expression suggests that the evil ecstasy of Eros becomes a kind of brute (Ficino). And the animal skin is interpreted as death, the satyr as sensual pleasure, Bacchus as brutal ecstasy which leads to death (Condivi). Then, Bacchus can be understood as one of the earlier works of the neo-platonist Michelangelo.