Abstract: Five types of coppor ion complexes including copper acetylacetonate, copper salicylate, copper citrate, sodium copper edetate and copper oxalate were prepared by a hydrothermal method and then introduced into polyvinyl chloride (PVC)as a smoke-suppressing agent. The effects of these copper ion complexes on the smoke-suppressing, flame-retardant and mechanical properties of PVC were comparatively studied by using smoke densimeter, limiting oxygen index analyzer and electronic universal testing machine. The results indicated that these five copper ion complexes could enhance the flame-retardant and smoke-suppressing properties of PVC. The PVC compounds achieved an increase in notched impact strength by over 30 % when 6 phr of copper citrate or copper oxalate was incorporated, and however the addition of ethylenediamine tetraacetic acid copper sodium, copper acetylacetonate and copper salicylate reduced the mechanical properties of PVC.