Abstract: GC-MS was applied to the determination of atrazine in soil with solid-phase extraction. The soil sample was extracted by soxhlet extraction, then purified with silica solid phase column. The TR-5MS column was used for GC separation and the selected ion monitoring mode was adopted in MS determination. Linear relationship between values of peak area and mass concentration of atrazine was kept in the range of 5.00-200 μg·L-1 with detection limit of 0.32 ng·g-1. Values of recovery found by standard addition method were in the range of 88.2%-90.7%, with value of RSD (n=10) of 4.8%.