Abstract: On basis of the mathematical model for electrolyte diffusion in flow with a pulse input,a velocity measuring system for sheet flow is designed by analyzing the influences of flowing water on solution transport and its electrical property.A operation system is written with Visual Basic for automatically data collection,velocity estimation and parameter analysis.The flume experimental data indicated that the velocity values estimated with this advanced system agreed well with those from the volumetric method which demonstrates the feasibility of the methodfor velocity measurement of velocity in sheet flow.This method and system can also be used in other related fields.