CsI crystal is produced by the environmentally-friendly closed Bridgman method to mass-produce large-sized scintillation single crystals of Ф 90×300 mm and above, including all kinds of one-dimensional line arrays, two-dimensional plane array products, and customized products. The products were widely used in Baggage security check, vehicle and container check, Industrial non-destructive inspection, food safety testing and high energy physics.