The surface synoptic situations which affect the air pollution in Beijing area are classified. Using the data of surface observation and upper air sounding from 1998 to 2000 in the southern suburbs of Beijing, the meteorological features of the surface and lower layer in Beijing area that is controlled by the various surface synoptic situations are analyzed. It is found that air pollutants are easily confluent and accumulated when the weather in Beijing is controlled by the low-pressure type at surface. Comparing the influences of the various surface synoptic situations on sulfur dioxide, nitrogen dioxide, PM₁₀, carbon monoxide, respectively, it is shown that the influence of the same surface synoptic situation on various air pollutants is different,It further approves that the low-pressure weather would easily cause the severe pollution in Beijing.