Tri-functionality polyNIMMO was synthesized by polymerization of NIMMO (3-nitratomethyl-3-methyloxetane) in the presence of trimethylolpropane catalyzed by BF3•OEt2. Then, alkenyl polyether energetic binder was synthesized by polymerization tri-functionality polyNIMMO and AGE (allyl glycidyl ether). The polymer was characterized by FTIR and NMR. Moreover, the mechani-cal properties and thermal properties of elastomer prepared with allyl polyether energetic binder and tetramethyl-terephthalobisnitrile oxide (TTNO) were investigated. The results show that the energetic binder has low viscosity (20℃, 8.93 Pa•s), low Tg(-57.4℃), and can be cured under room temperature; The molar ratio of —CNO and C═C was defineted as R, and when R=1.0, the tensile strength of the elastomer is 0.80 MPa and exothermic peak at 202℃.