How to define"environmental pollution"and the manner in which to define are fundamental issues in the China's environmental codification.China's current legislation defines"environmental pollution"in four different expressions,namely,"environmental pollution and other public hazards","pollution damage to the marine environment","pollution or contamination of the environment"and"pollution of the environment".Each country's environmental code defines"environmental pollution"in accordance with its own national conditions and the needs of the purpose of its codification.Environmental legislation should define"environmental pollution"at different levels and from different perspectives in accordance with the purpose and mandate of the legislation,responding to the multiple attributes of"environmental pollution"in environmental science.The definition of"environmental pollution"in the Environmental Code should be based on the objectives and tasks of the codification of the Environmental Code,reflecting the core values of sustainable development and focusing on the choice of the"moderate codification"model for the Environmental Code.The concept of"environmental pollution"in China's Environmental Code should reflect the conceptual attributes of the object of"environmental pollution"in order to define the legal scope of pollution control;reflect the concept of the fact of"environmental pollution"in order to construct the legal relationship and its institutional system of pollution control;and reflect the concept of the content of"environmental pollution"in order to construct the system of legal responsibility for"pollution of the environment".