(1) Metallurgy industry: As precipitating and resolving agent for rare earth metal, etc. (2) Organic Synthesis: For 2133 rein, ures form aldehyde powder etc. (3) Light industry: Polishing of DA LI stone, removing rust bleachingproductssof leather, wood and aluminium ect. (4) Printing Industry: Dyeing agent (5) Medicine Industry: For making tetracydine, HCl ect. (6) Others: As laboratory agent, solvents activato and basic materialsfor chemical industry