The Civil Code is a basic law with the functions of“strengthening the fundamentals,stabilizing expectations and benefiting the long term”.It is based on the Constitution and guided by the green principle.The production and lifestyle of green development has become the theme of China’s 21st century.It is the mission of the Civil Code to establish the green principle system.The green principle is the support point of ecological civilization construction in the new era,establishes the value judgment criterion of the new era,and lays down the dual protection principle of private interests and public welfare.The green principle provides the civil law basis for the protection of environmental resources,standardizes the obligation agreement and the compulsory use path.The legal obligation arising from the green principle is the innovation and adjustment of the contract system,and the tort liability expands the right remedy space for the damage to the ecological environment.The path of protecting the ecological environment by the green principle of the Civil Code includes:the green principle providing the system basis for the ecological environment litigation,the legal guarantee for the full implementation of the tort system,the compensation basis for the punishment of damaging ecological environment,and the judicial guarantee for the restoration and compensation of the ecological environment damage.