Abstract: Aiming at studying the deposition law of sand in labyrinth channel, the authors analyzed the particle trajectory and deposition law of sands by Fluent software. The results showed that the restitution coefficients affected critical deposition coefficients greatly, and the velocity fields were similar while the pressures changed greatly in different units. The sand trajectories were the same in each unit with the same initial conditions, such as location, diameter, velocity and so on. It was also showed that the particle diameter was the most important factor affecting the deposition of sand and the pressure was another important factor. Deposition ratio was raised with the increase of particle diameter. And the higher the inlet pressure was, the lower the deposition ratio was. The research on the deposition law of sand in labyrinth-channel emitter is beneficial to understanding of clogging mechanism of emitters, and provides basis for anti-clogging structure design of emitters.