The dibenzothiazyl disulfide (accelerator DM) was first synthesized with 2-mereapto benzothiazole (accelerator M), fuming nitric acid and glacial acetic acid by one step.The effects of the reactions temperature, the reaction time, and the mass ration yield were discussed.The optimal reaction conditions established were that the reaction temperature was 20°C, the ration of accelerator and glacial acetic was 1:20, the reaction was time was 40 min, and the ration of fuming nitric acid and accelerator M was 2:1.Under above conditions, the yield of accelerator DM was 92.4% and the m.p. was 169.6-171.0°C.