By improving traditional limestone-gypsum flue gas desulfurization technology, and adding equipment such as spoiler rings, rectifiers and dehydrators, a complete set of wet desul-furization technology with high desulfurization efficiency,no droplets at the outlet and high gypsum quality has been devel-oped. After being treated, the desulfurization efficiency reaches over 98%, emission at outlet is below 75 mg/Nm3, and droplet emission at outlet is less than 50 mg/Nm3.