2,4/2,6-Diaminotoluene is mainly used as raw material for synthesis of TDI and polyether initiator. The polyether polyol synthesized from 2,4/2,6-diaminotoluene is uniform and meticulous, and can improve the heat insulation performance and low temperature size performance of the foam. It can also be used as curing agent for epoxy resin, dye intermediate and aromatic diamine curing agent for polyurethane elastomer and epoxy resin: dimethylthiotoluene diamine DMTDA, diethyltoluene diamine detda.