The interaction of TATB based PBX with rigid polyurethane foam (RPUF) in the linear heating-up process was investigated by TG-IR. The results show that the gas phase products released from the contact system are basically sum of the gas phase products released from the two isolated compositions and no new gas products occur. The curves of change in heat output for TATB based PBX, rigid polyurethane foam(RPUF) and their contacted system during the aging by 140 ℃/10 d were obtained by a microcalorimeter. The surface structures and element contents of the samples before and after heated were characterized by IR and XPS, revealing that the surface structures and element surrounding of the samples before and after contacted do not change and TATB based PBX and polyurethane foam have good compatibility.