Exotic topological domains in BiFeO₃ nanoislands have attracted much attention regarding their potential applications in advanced electronic devices. Here, different from the earlier reported disordered distributed BiFeO₃ nanoislands formed by a self-assembly method, we fabricated an ordered BiFeO₃ nanoisland array by mask-assisted pulsed laser deposition on a SrTiO₃ substrate, which exhibits a center-converged in-plane polarization component and a monodomain pattern along the vertical direction. Such center-type quad-domain structures exhibit high stability, maintaining their topological structures after heating to 250 °C and subsequently cooling to room temperature. Moreover, they can be switched by applying a scanning electric field and recovered by applying a heating and cooling process. Observing this topological structure in BiFeO₃ nanoislands might provide a suitable platform for further exploration of its topological phase transition properties, new functions, and potential applications.