Abstract: The velocity of sheet flow in simulating trough, which is at different slopes and discharges and sediment concentration, is measured with three methods, e.i., centroid-velocity calculating method, electrolyte-pulse method and flow-rate method. Comparing results measured by these three methods showed that velocity of flow measured by electrolyte pulse method agree with those of other two methods while no permeating in the bottom or no losing of salt solute in the experimental process. When the sediment concentration is too much, the error of velocity measured by electrolyte pulse method argument, but the discharge of flow affect the measuring results little. Prolonging the measuring distance can make the error of velocity measured by electrolyte pulse method decrease, which supposing the inputting electrolyte as a pulse become more in reason when the ratio between inputting time and measure interval decrease along the measuring distance increases. In a word, the electrolyte pulse method is feasible for measuring the velocity of sheet flow in the experimental condition.