Abstract: The waste water which is produced by the nuclear power plant adheres to the principle of classified collection and processing. This wastewater mainly includes the coolants, chemical waste water, the ground drainage and the drainage from nonradioactive region. The chemical waste water’s quality is poorer, contains many impurities, and has high electrical conductivity. And the activity concentration may be higher, such as chemical cleaning waste water, the drainage of chemical de-contamination and the waste water from radioactive chemical analysis laboratory, etc. This paper describes the treatment process of chemical waste water in typical nuclear power plants in China, and analyzes and summarizes various technological processes.