Abstract: In order to explore the enhancing abilities of PASP during phytoremediation, laboratory simulations of soil columns were designed to research the activated ability of different concentration of polyaspartic acid (PASP) on heavy metal lead (Pb) and cadmium (Cd) (joining leaching quantity and blank contrast). The experiments showed that, in the concentration range, PASP’s activated ability on heavy metals increased with the increasing of PASP’s concentration. With the pot experiments, it was seen that PASP could significantly enhance the effect on corn remediation of heavy metals contaminated soil. The heights of corn that applied 11 g/L PASP was 114.4 cm, which was better than the corn that applied EDTA (110.9 cm). It was proved that the best concentration of PASP application was 3 g/L and 7 g/L, and the absorption in heavy metals was 114.829 μg and 84.662 μg for Pb, and 54.447 μg and 66.915 μg for Cd. Compared with EDTA, the absorption amount of Cd increased about 10 times as well as 3 times of Pb. Further researches were designed to derive PASP with hydrazine hydrate and ethanolamine. Leaching experiments showed that the activation effect of heavy metals could be improved with ethanolamine modified PASP, which provided a better complexing agent for the repair of soil that contaminated by heavy metals Cd and Pb.