The influence of 3-methyl-4-nitroso-N-isopropylaniline, 3,5—dimethyl-4-nitroso-N-cyclohexylaniline, 3-methyl-4-nitroso-1-phenyl-1H-pyrazole and 3-metyl-4-nitroso-1H-pyrazole on rheokinetics vulсanization of elastomeric composition was investigate. The model systems on the basis of 1,4-cis-poly-butadiene rubber and of butadiene-(acrilo)nitrile rubber were used. The experimental compounds are the modifiers of elastomeric compositions. The pattern of influence of C-nitrosocompounds on vulcanization rate and degree of crosslinking established.