Behenyl acrylate is a kind of highly efficient pour point depressants. In order to promote theapplication of the pour pint depressant in transportation of crude oils, polybehenyl acrylate was synthesizedby solution polymerization. These conclusions can be drawn from the experimental results that the sequenceof chain transfer constants of four solvents is arranged in the following decreasing order: carbon tetrachloride(6.010-5)>chloroform (2.810-5)>methylbenzene (2.510-5)>tetrachloroethane (1.610-5). The average molecu-lar weight of polybehenyl acrylate mainly depends on the chain transfer constant of the solvents. However, ifthe monomer conversion was higher than 35%, an abnormal phenomenon occurred, resulting in higher aver-age molecular weight of polybehenyl acrylate obtained in methylbenzene solution compared to that obtainedin tetrachloroethane solution. It was attributed to the influence of gelation on the average molecular weight ofpolybehenyl acrylate, which was stronger than the impact of chain transfer in methylbenzene. Behenyl acrylate is a highly efficient pour point depressants. In order to promote the application of the pour pint depressant in transportation of crude oils, polybehenyl acrylate was synthesizedby solution polymerization. These conclusions can be drawn from the experimental results that the sequence of chain transfer constants of four solvents is arranged in the following decreasing order: carbon tetrachloride (6.010-5)> chloroform (2.810-5)> methylbenzene (2.510-5)> tetrachloroethane (1.610-5). The average molecular weight of polybehenyl acrylate mainly depends on the chain transfer constant of the solvents. However, if the monomer conversion was higher than 35%, an abnormality occurred, resulting in higher aver-age molecular weight of polybehenyl acrylate obtained in methylbenzene solution compared to that obtained in tetrachloroethane solution. It was attributed to the influence of gelation on the average molecular weight of polybehenyl acrylate, which was stronger than t he impact of chain transfer in methylbenzene.