Polyacrylamide (PAM) was added to fly ash to amend sandy soil. The migration of heavy metals, such as Cr, As and Ni in soil-plant system and the influence of PAM on it were investigated, respectively. The experimental design included three PAM application rates (0, 60mg/kg and 120mg/kg) and four fly ash application rates (0, 5%, 10% and 15%). The treatment without fly ash and PAM was prepared as a control. The results showed that the addition of fly ash increased the concentrations of Cr and Ni in the surface sandy soil, while there was a decline in As concentration at high fly ash application rates (15%). The addition of PAM could stabilize a large quantity of heavy metals within topsoil to control their leaching risk as well as reduce the amounts of Cr, As and Ni absorbed by corn.