The ability of enrichment and tolerance of sunflower seedlings to Cu,Pb were studied using the indoor culture technique.The results indicated that sunflower seedlings had high ability of enrichment to Cu,Pb,and their roots were main organs of enrichment,moreover the transportation ability of Cu from roots to stems and leaves was better than Pb's.Cu and Pb with low concentration stimulated the nutritive growth of seedlings;but under high concentration,except groups of Pb,other treatments inhibited the nutritive growth of sunflower seedlings.Cu,Pb inhibited activities of seedlings' root systems,stimulated the generation of proline in seedlings' stems and leaves,changed the distribution level of protein contents in the haulm and roots.The interaction of Cu and Pb had synergistic influence on nutritive growth of seedlings and physiological-biochemical reactions.Sunflower belong to the kind of plants that can enrich heavy metals,and it has strong tolerance