In the field of the contamination of environment with heavy metals, chelate-induced phytoremediation had a broad development prospect, and bioavailability of heavy metals in soil was always the key to this technology. In the laboratory conditions ,the pot experiment and BCR extraction technique were undertaken to study the distribution of form transformations of soluble heavy metals which added into soil and the effect of EDTA-Na2、DTPA and Tartaric Acid on the form of Cd and Zn in soil. The results show that Zn in the original soil mainly existed in reducible state primarily, residual and oxidizable secondly, while original Cd content was less, almost existed in residual. After soluble heavy metals of Cd and Zn into soil, heavy metal content of each form had increased obviously, while the content of Cd and Zn mainly existed in acid soluble With the addition of EDTA-Na2,DTPA and Tartaric Acid, the acid soluble of Cd, Zn had improved significantly, at the same time，the reducible and oxidizable levels were low，the residual did not changed obviously. Three kinds of chelate concentration had significant correlation with the acid soluble of Cd and Zn, while the DTPA had the highest correlation. When the additional concentration of EDTA-Na2 was 1.25mmol?kg-1，activation ability of EDTA-Na2 respectively reached the maximum value, but also increased more 34.16% and 23.24% than the blank groups. It showed that with the additional concentration of 1.25mmol?kg-1,EDTA-Na2 had a great potential for Cd and Zn remendiation of heavy metal pollution.