Digital water curtain can not only give us visual enjoyment, but also can give people a lot of convenience in daily life. Piezoelectric pump is characterized by small size, simple structure, low energy consumption, etc. The study on the digital water curtain system based on piezoelectric pump control is rare. In this paper, digital water curtain system based on piezoelectric pump control was studied and a set of experimental platform which can perform droplets experiment of piezoelectric pump was built. Optimal frequency of piezoelectric pump PSS20 is measured through experiments and it is 16 Hz. In this frequency, the smallest droplets spacing can be 16 mm. What's more, the number of droplets can be controlled precisely.