Abstract: A Doppler effect based on experimental apparatus for water wave characteristics is introduced.Under the irradiation of a stroboscopic light source，the Doppler effect of this kind could be observed via a hair glass screen by using this apparatus. By a designed photoelectric detection device，the frequency of wave and its change could be measured thus to realize the digital measurement of wave’s Doppler shift. When the wave source’s position is fixed，and it’s vibrating at a given frequency，according to Doppler low，by measuring the Doppler frequency at real-time，the detector’s speed could be measured thus the wave speed could be calculated. This apparatus provides a direct way of demonstrating Doppler shift thus good for the study of Doppler effect’s wave characteristics.

Key words: Doppler effect, wave velocity, Doppler shift