Abstract: SO₂ is one of total quality control of pollutions. It provides the theory and realistic reference meaning for pollutions reduction to investigate the changing trend and influential factors of SO₂. The SO₂ emission data are from China Environment Statistical Yearbook and the emission trend and reduction trend of SO₂ are showed firstly in the paper. Then, Logarithmic mean weight divisia method model and reduction model are applied to analyzing the influential factors effects and SO₂ reduction. The main results could be summarized as follows: 1) The industrial emission of SO₂ kept rising from 2000 to 2006 and descended in recent four years. Changes in the three regions of China were similar to national trend. However, the proportion of western region in whole emission increased in the past ten years. 2) The SO₂ reduction goal in "Eleventh Five-Year Plan" had been achieved. The industrial SO₂ made a greater contribution for reduction. Reduction volume in east region was the most. From the view of technique, it was the main method to increase SO₂ removal rate. 3) The average growth of industrial SO₂ was-65?10⁴ t. The scale of economic development, the industry structure and emission intensity had different contributions to the change, which were 315?10⁴ t,-344?10⁴ t,-36?10⁴ t,respectively. 4) Conditional convergence and absolute convergence obviously exit for the SO₂ emission intensity among provinces in China. The SO₂ reduction potential of different regions in conditional convergence would be 738?10⁴ t (equivalent to 1/3 of SO₂ emission in 2009). 5) If the reduction goal was 8%-10%, the industrial SO₂ removal rate must reach 74%-80%. The reduction situation would be severe. It was of vital importance in SO₂ reduction to promote the change in the pattern of economic growth.