The　stigmatized　character　of　hazardous　chemicals　has　caused　individuals　in　hazards　to　take　excessive　protective　actions.　Here,　social　capital　is　introduced　to　discuss　its　influence　on　the　protective　action　decision　model　(PADM),　considering　this　variable　has　a　relatively　high　individual　trust　level　in　regards　to　information　on　hazardous　chemicals.　A　model　was　constructed　by　taking　protective　action　perceptions　as　the　dependent　variable,　social　capital　as　the　independent　variable,　the　pre-decision　process　as　the　mediating　variable,　and　socioeconomic　status　as　the　moderating　variables.　Data　were　collected　with　a　neighborhood　sampling　method,　and　a　total　of　457　questionnaires　were　obtained　from　neighboring　residents　near　a　large　cold　ammonia　storage　house　in　Haidian　District,　Beijing.　Results:　While　the　family　and　friendship　networks　produced　a　larger　positive　influence,　the　kinship　network　produced　a　smaller　positive　influence;　furthermore,　the　influence　of　social　capital　must　be　brought　through　the　pre-decision　process;　finally,　socioeconomic　status　has　a　directional　moderation　on　the　friendship　network,　an　enhancing　moderation　on　the　kinship　network,　and　a　weakening　moderation　on　the　family　network.