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Recently diesel engines are required to get not only high performance but also low pollution gas quality (oxides of nitrogen, carbon monoxide, unburned hydrocarbons and smoke). Our approach to this requirement is based on the fuel spray theory that good fuel-air mixing in the fuel spray developed into the quiescent air depends upon high kinetic energy of the spray motion. From the theoretical analysis of fuel spray motion in the quiescent air and the photographic study of the fuel spray combustion, it was found that higher rate of air entrainment into the fuel spray by its own kinetic energy gives a very important effect on the increasing of combustion efficiency in the diesel engine and the reduction of soot formation.