Thiourea dioxide can be used as exchange of sodium hydrosulfite. The product has good heat stability, high as reducibility, easy operation and transportation and storage convenient and then used to organic synthes is in synthetic fiber industry, also used as additive of polythene sensitizer of photographical emulsion and so on. It is also used as reducing agent in printing and dyeing industry and used as pulp bleaching or de-inking of recycled fibers in the paper industry. There is no pollution during the operation.