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A floating-catalyst spray pyrolysis method was used to synthesize carbon anotube (CNT) thin films.With the use of ammonium chloride as a pore-former and epoxy resin (EP) as an adhesive,CNT/EP composite films with a porous structure were prepared through the post-heat treatment.These films have excellent thermal insulation (0.029-0.048 W· m-1· K-1) atthe thickness direction as well as a good thermal conductivity (40-60 W·m-1· K-1) in the film plane.This study provides a new film material for thermal control systems that demand a good thermal conductivity in the plane but outstanding thermal insulation at the thickness direction.