A new trend-carbide ceramifiable thermal insulation is proposed, which based on the excellent performances of nano-composites, such as flame-retardant and ceramification of montmorillonite on polymers. After the adding． low-melting point organic-modification nano montmorillonite is ablated and blowed by the high temperature combustion gas, a kind of viscous liquid can be formed and it will inter-crosslink with the decomposed char layer, blocking the volatilization of the pyrolysed gas and exfoliation of the resulted char-layer, as a result, the performances such as ablation, erosion-resistance and smoke signals will be improved. The results indicate that the performances of the thermal insulation are all optimized under the condition of the ratio of nano-montmorillonite to silica is 13 ∶27, meanwhile, the smoke-signals increased 50%.