Adopting the characteristics and micro-analysis of power in modern society, Michel Foucault presents another view of social power. Based on the theory Foucault proposed in Discipline and Punishment, this paper reconsiders the body social structure of Outlaws of the Marsh. In conflict with the power mechanism, the body discipline of Liangshan heroes tend to be concealed. As a result, they are not easily aware of the influence caused by the power authority. Proceeding from Micro-Power Theory of Foucault, this paper analyzes how the heroes of Outlaws of the Marsh demonstrate various disciplines under power operation.