Abstract: A new fabrication technology of carbon fiber reinforced pyramidal lattice truss core sandwich structures was presented. It dealt with the disadvantage of such traditional technology as the facesheets and core needing bonded or joined additionally. Both ends of truss members were embedded into the facesheets without evident interface between the core and facesheets. The pyramidal lattice truss core sandwich structures were tested under compressive load. Observation of the buckling and splitting of truss members was done during the tests. And the compressive stiffness and the limit buckling load of the lattice truss core sandwich structures were calculated theoretically. Compared with the traditional sandwich structures, the pyramidal lattice truss core sandwich structures have the advantages of lower density, higher specific stiffness and higher specific strength.