This paper introduces the study for population migration in mainland China and its applications to SARS control. This paper analyzes following issues by using Geographic Information System

（1）the characteristics of immigratory population and migratory population in cities

（2）inflow spatial features for migrant workers in Beijing and Guangdong respectively

（3）situation prediction for migrant workers reflunce to Beijing

and （4）spatiallg distributing features for SARS along traffic lines. According to above studies

some elementary information can be given for SARS control decision-making. （1）The cities

where immigratory population are more than or less than migratory population and the situation along the traffic line can be pointed out here

and how to take measures to cut off the disease of spreading in these cities is obvious;（2）The study on migrant workers can provide some advise to the rural SARS control measures

such as quarantine measures;（3）According to phenological statistic and some raw data for migrant workers

some predictions for the rush hour of migrant workers

who inflow Beijing again refluence can be given roughly.