This paper explores the realization of corporate environment responsibility (CER) by legal system. The corporate production and management have an important effect on environmental problems, but it is difficult for enterprises themselves to carry out environmental responsibility. By the analysis of China's legal system concerned and the status quo of CER, it can be concluded that the realization of CER should be guaranteed by the arrangement and implementation of a series of legal systems, at least including implementing the Green Market Access system, improving the Corporate Environmental Information Disclosure system, propelling the Cleaner Production system, enforcing the Environmental Labeling system and establishing the Emission Trading system.