The effect of chain topology on the self-assembly behavior of AB-type block copolymers confined in thin film was studied using the self-consistent field theory method (SCFT). Firstly, the AmB miktoarm star copolymer was designed and the effect of the number of arms m on the stability of per-forated lamella (PL) structure was investigated by constructing the phase diagrams for m = 1, 2 and 4 with the volume fraction (fA) and size of confinement (D). The increasing m is beneficial to expanding the stable phase region of the PL structure, while it increases not very obviously when m > 2. Then fix m = 2 and the ABAT-type block copolymer was designed by regulating the tethering point of one A block on the B block, which is characterized by the parameter τ. The favorable τ for the stability of the PL phase is examined by constructed the phase diagram of fA~D, where the free energy contributions, segment distribution and feature size of the PL structure under different τ are analyzed. It indicates that the degree of freedom of the A block is affected by the tethering point on the B block, and its spatial distribution in the domain affects the stability of the PL structure. This study provides theoretical guidance for the preparation of perforated structures in related experiments.