Abstract: The graphene oxide (GO) was modified by an amidation reaction using polyetheramine and triethylenetetramine, and then its structure was characterized by Fourier-transform infrared spectroscopy and X-ray photoelectric spectroscopy. The two types of amino-modified GO were introduced into the rigid polyurethane (RPU) foams and their effects on the morphological structure, apparent density, compressive strength and the thermal conductivity of composite foams were comparatively investigated. The results indicated that, the addition of two types of amino-modified GO led to a smooth cell wall, uniform cell structure and small average pore size for the resulting RPU composite foams. The investigation of mechanical performance showed that the addition of amino-modified GO caused an improvement in the apparent density, compressive strength and modulus of composite foams, and however an opposite effect was achieved with the addition of GO virginal. The thermal conductivity of composite foams was found to increase slightly in an acceptable range due to the presence of any types of GO.