This paper discusses about lust and caution of the book-Journey to the West. Lust and caution are one of the big commandments in the Buddhism. Every time Tang-monk faced the sexual temptations, even he was force to do it, he still kept his hear clear. He insisted on going on a pilgrimage for Buddhist scriptures. Beyond the appearances of lust and caution, Tang-monk's passiveness, passiveness and the fates of evil women reflected the author of Journey to the West's conceptions of lust and caution. This paper is divided to four parts. The fist is why I chose Tang-monk as studying object. The second is the temptations. One is male temptations, the other is longevity temptation. The third is lustful calamities. One is using lust to make a calamity; the other is Tang-Monk's conception of virginity; another is women disasters: evil women didn't coquette Tang-monk, but they would coquette his mind. The forth is conclusion.