In this study, we first use a one-pot reaction system of conjugate addition, arenesulfonyl chlorides are reacted with sodium sulfite and sodium bicarbonate and produce the arenesulfinic acid sodium salts. Second, the arenesulfinic acid sodium salts are reacted with activated olefins. Finally we acquire the conjugate addition products. This one-pot reaction is conducted in air at 80℃, providing the corresponding products in medium to good yields. Conventionally, arenesulfinic acid sodium salts need to be purified by recrystallization in ethanol. There is an advantage in our work that the reaction does not need to purify arenesulfinic acid sodium salts, and arenesulfinic acid sodium salts can be reacted with activated olefins.