"Frustrated Lewis Pairs" (FLPs) as a new concept in organic chemistry was used in metal-free activation of some small molecules such as H-2, CO2 and NH3, and its researches and applications are very attractive to chemists. The good to excellent results were obtained in catalytic hydrogenation of aldehydes, enamines, imines, nitriles and CO2 by using various FLPs as catalysts and H-2 as hydrogen source. The chiral FLPs also demonstrate good enantioselectivities in metal-free catalytic hydrogenation of imines, and the enantiomeric excess of the corresponding amines is up to 83%. This review describes the development of FLPs for metal-free catalytic hydrogenation in recent years.