Abstract: Based on the analysis of air quality in Jinan,multi-source numerical model is used to calculate contribution rates of different kinds of sources to air pollution concentration and analyze the sources of SO₂ pollution.The results are as follows.The spatial distribution of SO₂ in Jinan displays the characteristic of two peaks,mainly caused by medium-height and low sources.The sum of medium-height and low sources occupies one third of the total emission,but plays a primary role in the distribution of SO₂ concentration.High source has large amount of emission,but contributes less to the distribution of SO₂ in the region of the study.The effect of high sources on surrounding areas of the city should be considered.Therefore,it is essential to control medium-height and low sources for SO₂ pollution control in Jinan.