高阶能带拓扑不仅丰富了我们对拓扑相的理解，还揭示了新奇的低维边界态，这在下一代 器件应用中具有巨大潜力。二维材料独特的电子结构和可调控特性使其成为实现二阶拓扑绝缘体 （SOTIs）的理想平台。本文概述了二维电子材料领域中 SOTIs 的研究进展，重点介绍了高阶拓 扑特性的表征以及理论研究中提出的众多候选材料。这些研究不仅增强了我们对高阶拓扑态的理 解，还丰富了实验中可行的候选材料。 

Higher-order band topology not only enriches our understanding of topological phases but also unveils pioneering lower-dimensional boundary states, which harbors substantial potential for next-generation device applications. The distinct electronic configurations and tunable attributes of two-dimensional materials position them as a quintessential platform for the realization of second-order topological insulators (SOTIs). This article provides an overview of the research progress in SOTIs within the field of two-dimensional electronic materials, focusing on the characterization of higher-order topological properties and the numerous candidate materials proposed in theoretical studies. These endeavors not only enhance our understanding of higher-order topological states but also highlight potential material systems that could be experimentally realized.