The　synergistic　stabilization　effect　of　different　metal　lanolin　fatty　acids　as　natural-based　thermal　stabilizers　for　poly(vinyl　chloride)　(PVC)　including　calcium　lanolin　fatty　acid　(Calan(2)),　zinc　lanolin　fatty　acid　(Znlan(2))　and　lanthanum　lanolin　fatty　acid　(Lalan(3))　were　studied　through　Congo　red　testing,　color　measurements,　FTIR　analyses　and　thermal　behavior　in　this　paper.　The　results　showed　that　Lalan(3)/Calan(2)/Znlan(2)　stabilizers　exhibited　more　excellent　thermal　stabilization　efficiency　to　PVC　than　Calan(2)/Znlan(2)　thermal　stabilizers,　and　the　optimal　mass　ratio　of　Lalan(3)/Calan(2)/Znlan(2)　was　8:9:3.　At　last,　the　effect　of　degradation　mechanism　on　PVC　and　synergistic　stabilization　was　also　investigated　by　FTIR　analyses　and　thermal　behavior.