With the rise of graphene, two-dimensional nanomaterials have been significantly developed in recent years. As novel two-dimensional nanostructures, borophene and alkaline-earth metal boride two-dimensional materials have received much attention because of their unique physical and chemical properties, such as high Fermi velocities, high electron mobilities, large Young's moduli, high transparencies, negative Poisson's ratios and high chemical stabilities. This paper focuses on the researches of the fabrica...