In this article，four kinds of different alkyl substituted diallylmethyl quaternary ammonium salt monomers were synthesized. Four kinds of diallylmethylalkyl (C3, C5, C7, C9) quaternary ammonium salts were synthesized using diallylmethylamine and 1-bromide straight chain alkanes as raw materials.The effects of reaction on time，temperature，molar ratio of raw materials and different solvents were discussed. Structures of the products were characterized by IR，1HNMR and 13CNMR. The results showed that the yields of the products were 78.18%，82.54%，84.63% and 81.32%，respectivly,under the optimum synthetic conditions. The obtained products possessed the expected structures. In addition，the products were miscible well with polar solvent and their melting points decreased with the increase of the straight alkyl chain length. The progresses completed above had provided a foundation for the researches on preparation，mechanism and application of the corresponding polymers.