IIn this paper，a series of high resilience silicone-modified polyimide foams （IBPIF-Si） were prepared.The pore structure， mechanical properties， foaming principles and the highest operating temperature of IBPIF-Si were investigated.Compared to pure IBPIF， IBPIF-Si showed the low density ［（22.0±6.7）mg/cm³）］，high porosity（97.93%），excellent hydrophobic ［the water contact angle was （128±2.72）°］ and outstanding flexibility（with a linear elastic region was 0~14.77%）.This unique modification method broadened the potential application of polyimide foam in the aerospace sector，including heat insulation，noise reduction，insulation and other aspects.