In the future, we are anticipating the discovery of non-Horiuti-Polanyi mechanism will help the chemists to control the metal-based and alloy-based hydrogenation better, developing different catalysts that can have a better chemical selectivity of hydrogenation. Different ligands will be designed for the metal complexes and catalysts, lowering the barrier and improving the selectivity further. A variety of substituent groups will be designed for the divalent main-group catalysts, providing a potential for asymmetric hydrogenation. As for FLPs catalysis, there is a possible combination with the transitionmetal complexes, and more elements might be used as acid/base centres in FLPs. In addition, computing and calculation technology will also offer more opportunities to find better catalysts.