Abstract: Taking Cosmes bipinatata and Zinnia elegans as test materials, the effects of different concentrations of Cd(0,0.5,1.0,5.0,10.0 mg·L^-1) stress on seed germination, seedling tolerance and enrichment of two species Compositae plants（Cosmos bipinnata and Zinnia elegans） were studied by a filter papaer germination method and solution culture experiment, in order to provide reference for remediation of Cd contaminated soil by direct seeding.The results showed that 0.5 mg·L^-1Cd treatment had a significant stimulating effect on the germination rate of Cosmos bipinnata,but had no significant effect on the germination rate of Zinnia elegans;the germination rate, germination index and vitality index of two tested species all decreased significantly with the increase of Cd concentration.The root length and bud length of Cosmos bipinnata decreased with the increase of Cd concentration; the root length and bud length of Zinnia elegans was not significantly affected by 0.5 mg·L^-1 Cd treatment, but was seriously inhibited by 10.0 mg·L^-1 Cd treatment and the root length inhibition index reached 97.74%;the content of chlorophyll a, chlorophyll b and carotenoid of two tested species in the seedling stage（30 days） were not significantly affected by Cd stress.When exposed to 10.0 mg·L^-1 of Cd, the shoots Cd content of Cosmos bipinnata was 88.54 mg·kg^-1,and the shoots Cd content of Zinnia elegans was 211.76 mg·kg^-1,the bioconcentration factors of two tested species were all greater than 1.The two tested species grew with nearly normal state under low concentrations of Cd(＜5.0 mg·L^-1),with a strong tolerance to Cd, so they had certain application potential in phytoremediation of urban Cd contaminated soil.