4-dimethylaminopyridine (abbreviation DMAP) is a widely used catalyst in a variety of organic reactions, so it is called super-catalyst. In this article, we designed and researched a new synthesis route by Using 4-cyanopyridine and styrene as raw materials. The optimum conditiongs were given n(4-cyanopyridine)/ n(styrene)= 1:1.2, and w (40 %) sodium hydroxide solution was added to decompose the intermediate under reflux for 2h. The yield of the product reached 73.8% and styrene could be recovered. The structure of target compound was confirmed by IR, HNMR..