This paper highlights our recent results concerning the self-assembling behavior of block copolymers, in which two length-scale-ordering morphologies are involved, by employing the dissipative particle dynamics (DPD) method. In particular, two molecular architectures by combining an A-homopolymer block with a BC-comb block or a BC-alternating block, which are referred as A-block-(B-graft-C) and A(2)-star-(B-alt-C), respectively, are examined. Generally speaking, as long as the three components are significantly incompatible one another, various types of hierarchical structures, such as spheres-within-lamellae, cylinders-within-lamellae, gyroid-within-lamellae, lamellae-within-lamellae, lamellae-within-cylinders, and lamellae-within-spheres, can be formed in both molecular architectures. However, they exhibit a completely different packing behavior of molecules due to the difference of molecular architecture. In particular, the small-length-scale lamellae formed by the B-alt-C and B-graft-C chains display a parallel and perpendicular direction, respectively, with respect to the large-length-scale structure. We believe this characteristic difference could impose different influences upon various properties of polymers, such as photoelectronic properties, and lead to different potential applications. (C) 2009 Elsevier Ltd. All rights reserved.