Two kinds of low density ablative thermal protection materials reinforced by honeycomb was developed
according to the requirements of long time ablation and thermal protection. Arc heated wind tunnel experimental were
applied to test their property of thermal protection. Their mechanical property and thermophysical property were researched
also. The carbon layer of the low density materials reinforced by honeycomb on the surface was even and intact
after ablation without erosion markedly while the back temperatures were below 200℃ under the two long time(1 000 s)
heat environment and excellent heat-insulating property and well poperty of resisting the flush of gas flow was displayed.