A　silica　gel　modified　by　thioacetamide　as　a　solid-phase　absorbent　was　synthesized.　A　silica　gel　modified　by　thuoacetamide　as　a　solid-phase　absorbent　was　synthesized,　and　its　adsorption　properties　were　investigated　by　flame　atomic　absorption　spectrometry　(FAAS).　The　influences　of　parameters,　including　pH　value,　shaking　time　and　adsorption　capacity　in　batch　processes　and　flow　rates　of　sample,　eluent　condition　and　sample　volume　in　column　processes,　on　the　quantitative　recovery　of　Cu2+　and　Pb2+　were　studied.　Conditions　for　the　effective　extraction　were　optimized.　In　an　aqueous　medium　of　pH　5.0,　the　absorbent　adsorbed　Cu2+　and　Pb2+　ion　strongly　and　equilibrium　of　absorption　was　achieved　by　shaking　for　25　min.　The　adsorptive　capacity　of　Cu2+　and　Pb2+　ion　was　15.05　mg/g　and　21.10　mg/g,　respectively.　This　method　has　been　applied　in　the　determination　of　lead　and　copper　in　water　samples,　98.4%~102.0%　recovery　is　obtained.