This　research　aims　at　combined　and　relative　effect　levels　on　anxiety　of:　(1)　perceived　risk,　knowledge,　optimism,　pessimism,　and　social　trust;　and　(2)　four　sub-variables　of　social　trust　among　inhabitants　concerning　living　on　heavy　metal　contaminated　soil.　On　the　basis　of　survey　data　from　499　Chinese　respondents,　results　suggest　that　perceived　risk,　pessimism,　optimism,　and　social　trust　have　individual,　significant,　and　direct　effects　on　anxiety,　while　knowledge　does　not.　Knowledge　has　significant,　combined,　and　interactive　effects　on　anxiety　together　with　social　trust　and　pessimism,　respectively,　but　does　not　with　perceived　risk　and　optimism.　Social　trust,　perceived　risk,　pessimism,　knowledge,　and　optimism　have　significantly　combined　effects　on　anxiety;　the　five　variables　as　a　whole　have　stronger　predictive　values　than　each　one　individually.　Anxiety　is　influenced　firstly　by　social　trust　and　secondly　by　perceived　risk,　pessimism,　knowledge,　and　optimism.　Each　of　four　sub-variables　of　social　trust　has　an　individual,　significant,　and　negative　effect　on　anxiety.　When　introducing　four　sub-variables　into　one　model,　trust　in　social　organizations　and　in　the　government　have　significantly　combined　effects　on　anxiety,　while　trust　in　experts　and　in　friends　and　relatives　do　not;　anxiety　is　influenced　firstly　by　trust　in　social　organization,　and　secondly　by　trust　in　the　government.