The synthesis method of 2?ethyl?2?aryl?dihydroquinoline derivatives was studied. The synthesis is divided into three steps: the first step, the Suzuki cross?coupling of 2?bromoquinoline and phenylboronic acid; the second step, the exchange of halide lithium; the third step, the nucleophilic addition of the organolithium reagent to the α?position of 2?phenylquinoline to obtain a double?substituted dihydroquinoline derivative. The drug with dihydroquinoline structure was synthesized by this method, and the target product was analyzed by various characterization methods, and the structure of the target product was confirmed.