Nonlinear Imbert-Fedorov (I-F) effect was discussed theoretically. Only Kerr nonlinear optical medium was discussed. The results appear that nonlinear Imbert-Fedorov effect; near the critical angle, in negative Kerr effect nonlinear optical medium is smaller than linear Imbert-Fedorov effect in the linear optical medium. With increasing of light intensity, Imbert-Fedorov effect decrease gradually and emerge negative shift.