Abstract: The characteristics of soil preferential flow, the preferential migrate in soil for non-absorptive bromide, nitrate ions were studied.With undisturbed, packed soil columns,the results showed that soil preferential flow was characterized with preferential breakthrough,non-symmetric breakthrough curve,lateral infiltration,tailing, so on.The preferential breakthrough for Br^- was 24 hours after it was applied,and the leachate volume was only 0.04 times asmuch as the pore volumes.The preferential flow for Br^- accounted for 26% of total flux in the undisturbed soil columns.But the accumulative leachate mass for Br^- resulted from the preferential flow were 86.7% of total accumulative leachate mass,showing that the soil preferential flow accounted for relative small ratio of the flux,but caused re lative much more solute transference.NO₃^- was moved down rapidly by preferential flow at only one time as large as pore volumes,and got 11% of the applied amount,respectively.As a result of the preferential flow,the lateral infiltration flow enabled Br^-, NO₃^- rapidly distribute, diffuse into the deeper soil.