Pot experiments is are done to research toxicity effects of Cr and As, as well as their interaction and influences on migration in soil-plant system. The results show that:(1) When Cr is treated singly,with the increasing of Cr concentration,the amounts of residual Cr in soil increase,but the proportion of residual Cr to added Cr is decreased.This illustrates that added Cr can promote migration of soil Cr to rye plants.(2) With the heightening of As levels in interaction treatments,the amounts of residual Cr increase in the same treatment.The adding of As can prohibit migration of soil Cr to plants,and with the increasing of As concentration,the prohibition of As is stronger.(3) When As is treated singly,with the increasing of As concentration,the amounts of residual As in soil increase,but the amounts of residual As in soil are greater than added As.As that is assimilated by the plants is influenced slightly by added As.(4) In the process of interaction treatments,at the same As level,with the increasing of Cr concentration,the contents of As in rye plants change equably.The As contents of plants at the different As level change at the same trend.The migration of As in soil to plant is influenced slightly by added Cr.