To investigate the temperature effects on fracture behavior of HMX-based polymer bonded explosives （PBX） under quasi-static loading， the digital image correlation method （DICM） and crack propagation gauge （CPG） testing system were used in quasi-static fracture tests of the semi-circular bending （SCB）. The fracture characteristics， fracture resistance， damage tolerance and crack unstable propagation rate of HMX-based PBX at different temperatures （25 to 65 ℃） were studied. The results show that with the increase of temperature， the fracture characteristics of HMX-based PBX gradually transform from brittle fracture to ductile fracture， the fracture toughness which indicates the crack initiation resistance significantly decreases， and the damage tolerance is slightly improved. Under the brittle fracture condition of SCB， the crack unstable propagation rate shows a slow-fast-slow law on the propagation path， with a maximum rate of about 370 m·s^-1. The increase in temperature leads to some reduction in the crack unstable propagation rate.