The purpose is to study the temporal and spatial distribution features of SO2 and its relationship with impact factors such as wind, humidity and precipitation in urban areas of Yantai. The results demonstrate that the emission of SO2 had been capable controlled from 2008 to 2010. The meteorological conditions also take the key part in spread of SO2, wind and precipitation are the main factors affecting of it in Yantai. Concentrations change significantly with seasons, which remain low in vast majority of periods. Contamination is generally concentrated in the range of major pollution sources within 7 kilometers. And it implies that after the reduction of SO2 pollutant concentrations, the planning and adjustment of industrial areas and residential areas still need to be paid attention.