The energetic binder poly(2,2-dinitropropyl acrylate) (PDNPA) was synthesized by the free radical polymerization of 2,2-dinitropropyl acrylate in toluene with azobisiosbutyronitrile as initiator,and were characterized by FTIR,¹HNMR,UV and DSC. The effects of initiator concentration and temperature on polymerization were investigated. Results show that the average molecular weight of the polymer decreases and molecular weight distribution (MWD) becomes narrow as increasing initiator concentration. Monomer is with 60% conversion obtained at 80 ℃ within 2 hours. The thermal decomposition temperature of PDNPA is 252.8 ℃.