Abstract: Encoding is an important tool to convert text information into computer programming code. For the wide application of coefficients, the coding method for converting the production and discharge coefficients into numeric and letter codes has been established. Based on the expression of generation and discharge coefficients of 2017 edition, the pollutant generation coefficients and discharge accounting parameters were coded respectively. The main factors determined the coding structures and contents of the pollutant generation coefficients, including industries, pollution generation sections, products, raw materials, processes, scales and pollutant types. The coding of emission accounting parameters was separately coded by the pollution treatment technology and the operation efficiency of treatment facilities. According to the types and characteristics of various key factors, the code rules and the number of digits were formulated, and the coding scheme was applied using the "3825 photovoltaic equipment and components manufacturing industry" as an example. The pollution coefficient coding was 22-bit coding, and emission accounting parameter coding was 28-bit or more coding. This coding method will provide direct support for the establishment of the information platform for pollution production and emissions coefficients, the continuous updating of coefficients, and the application to more environmental management systems.