1, Dye industry for the production of sulfide dye, is the raw material of sulfide green and blue sulfide. The printing and dyeing industry is used as a counterstain to dissolve sulfide dyes. It is used in the leather industry for hydrolysis, and it is also used to prepare sodium polysulfide to accelerate dry skin immersion. The paper industry is used as a cooking agent for paper. The textile industry is used for artificial fiber denitration and nitrate reduction, as well as cotton fabric dyeing medium. The pharmaceutical industry is used in the production of antipyretic tics such as phenacetin. In addition, it is also used to make sodium thiosulfate, sodium sulfur hydride, sodium polysulfide, etc.

2，Adding an appropriate amount of sodium sulfide in aluminum and alloy alkaline etching solution can obviously improve the etching surface quality, and can also be used for the removal of alkali-soluble heavy metal impurities such as zinc in alkaline etching solution.

3, Sodium sulfide can also be used for the treatment of conductive layer in direct plating, through the reaction of sodium sulfide and palladium to form colloidal palladium sulfide to achieve the purpose of forming a good conductive layer on the non-metallic surface.

4, used as a corrosion inhibitor. It is also sodium thiosulfate, sodium polysulfide, sulfide dyes and other raw materials.

5, used in the manufacture of sulfide dyes, leather depilation agent, metal smelting, photography, rayon denitration, etc.