Based on ablative mechanism and light weighting principle， heat-shielding & insulating and radar-absorbing composites （HRC）， which efficiently integrated the functions of thermal protection， insulation and radar absorption in wide frequency， were prepared by sol-gel technology and resin transfer molding. SEM images showed that wave-absorbers of multi-walled nanotube （MWNT） well dispersed in the skeletons of hybrid phenolic aerogel. With increasing MWNT loading， the average pore diameter of HRC decreased and the mechanical properties were largely improved. When the MWNT loading was 5.0 wt%， compressive modulus of HRC was 1.8 times higher than that of HRC without MWNT addition. The introduction of MWNT wave-absorbers greatly improved radar-absorbing performance of HRC. The reflection loss of HRC lowered －8 dB after introducing MWNT wave-absorbers between 4 GHz and 18 GHz. In addition， HRC displayed outstanding ablative and heat-insulating properties during test of arc-jet wind tunnel. As the surface temperature of HRC reached 1700℃， temperature rise of backface with 20 mm thickness was only 153℃ and had near zero ablative recession after 400s ablating. In particularly， HRC still possessed good radar-absorbing performance in wide range of frequency after ablation in arc-jet wind tunnel.