As a “black box”channel routing method, the channel routing curve has the feature of simple in principal and flexible using. The application results in this paper show that: ① If the base flow is ignored, the routing accuracy of the precipitously fluctuant flood using the channel routing curve deduced by the Muskingum method is the same with the Muskingum method itself. ② It can simulate the channel infiltration effectively and improve the precision of the simulation by adjusting the value of the channel routing curve. ③ The curve can simulate the flood lag phenomenon and the discharge distribution process. ④ It can effectively avoid the "mean value" phenomenon of the converted channel routing curve that applying cubic spline interpolation to fit the S accumulation curve in time conversion of the channel routing curve, also it is necessary to revise the“special”situation of convex and concave shape in curve fitting to guarantee the rationality of the S accumulation curve.