▎ 摘　　要

Lightening thermal insulation system is significantly crucial for the high-cost aerospace field. This paper prepared novel thermal insulation composites, N-doped graphene aerogels reinforced by ultrafine quartz fibers. The density is only 0.072 g/cm(3), and the thermal conductivity measured by Hot disk apparatus is 0.0327 W/(m K). Meanwhile, with reinforced by ultrafine quartz fibers, the tensile strength of the composites reaches 3.61 MPa. The ultralow density, low thermal conductivity and high strength make the composites potentially useful thermal insulation materials in the aerospace field.