The binder film of 3, 3-bis(azidomethy)oxetane-r-(glycidyl azide)(BAMO-r-GAP)copolymer/N100/IPDI system was synthesized using BAMO-r-GAP copolymer as pre-polymer, N100 and IPDI as curing agent and BDO as chain extended agent. The Fourier transform infrared(FT-IR)spectrometer, differential scanning calorimetry(DSC) and thermogravimetry-derivative thermogravimetry(TG-DTG) were used to characterize the binder film, and the mechanical properties was also measured. Results show that the tensile strength of the binder film is raised to 0.87 MPa, and the breaking elongation is above 106%. The glass transition temperature (T_g) of the binder film is about -50 ℃ and the thermal decomposition starts at 217.0 ℃, which means the binder film has good thermal stability.