孟达三次背弃旧主,终至败亡,在史书上留下了“反覆”之名;但从实际情况分析,孟达“反覆”并至败亡有着深刻的主客观因素,其绝刘降曹与叛魏归蜀均是被迫而为之,不能仅仅归结于个人原因。孟达败亡实为刘蜀政权内部集团斗争的牺牲品。 Mengda three times to abandon the old Lord, and finally died, in the history books left “repeatedly” in the name; but from the actual situation analysis, Mengda “repeatedly” and to the point of death has a profound subjective and objective factors, Liu Jiang Cao and rebel return to Shu are forced to do, not only because of personal reasons. The defeat of Mengda really fell victim to the internal group struggle in the regime of Liu Shu.