The non-combustibility of PTFE fabric0s was investigated by Cone Calorimeter in this paper. Ignition parameter, heat release parameter, mass loss parameter and smoke parameter of PTFE fabrics were obtained. The Time to Ignition of PTFE fabric and PTFE/Nomex fabric were 60 and 24s respectively, and the Heat Release Rate were 9.28 and 65.52kw/m2 respectively. The Total Heat Release of PTFE fabric and PTFE/Nomex fabric increased with time, and the Total Heat Release of PTFE/Nomex was much higher than that of PTFE fabric. The Effective Heat of Combustion were 5.06 and 9.94mj/kg respectively, the maximum of mass loss rate of PTFE fabric was larger than that of PTFE/Nomex fabric, and the curve of mass loss rate of PTFE fabric changed rather slightly. It can be concluded that the non-flame properties of PTFE fabric was more remarkable than that of PTFE/Nomex fabric.