The authors have studied the yields of titanium, zirconium and hafnium nitrides in air combustion products of the mixtures of aluminum nanopowder with related dioxides. It was ascertained that maximum yield of titanium nitride is achieved at aluminum nanopowder content of 30...55 wt. %, zirconium nitride - more than 20 wt. % and hafnium nitride - higher than 15 wt. %. The results obtained are explained by high reducing capacity of aluminum nanopowder while combusting and by chemical binding of air nitrogen, and by the decrease of oxygen activity at high temperatures.