A method of preparing a plastic-based composite profile comprised of a plastic mass containing a plurality of wood particles embedded in the plastic mass by bringing a plurality of dried wood particles and a thermoplastic polymer together with optional additives together to form a plastic-wood particle mixture, blending the plastic-wood particle mixture in blending means at a temperature sufficiently high to at least partially melt the thermoplastic polymer so as to be capable of uniformly blending with the wood particles to form a blended plastic-wood particle mass constituting an initial agglomerate; transforming the initial agglomerate into a profile preform by subjecting the agglomerate to the action of a double screw multi-zone extrusion means thereby shaping the profile preform into a profile by pushtrusion so that the agglomerate flows under pressure as a plastic plug flow in the extrusion means and through orientation and shaping stages to thereby obtain the composite profile.