Abstract: In order to study the clogging mechanism of the drip irrigation system of Yellow River diversion in the field, and to reduce the clogging of the irrigation system in the field, based on the characteristics of sediment in Zuncun irrigation district of Yuncheng, Shanxi Province,SolidWorks is used to model and design the flow path of emitters. The simulation parameters were set according to the actual engineering conditions of drip irrigation, and Ansys Fluent simulation software is used to simulate the flow passage of different types of emitters. The turbulent characteristics such as pressure, velocity and turbulent kinetic energy of the emitters, as well as the particle trajectories are studied to reveal the internal flow mechanism of the emitters. The pressure of the fluid basin inside the emitters decreases linearly with the flow channel units, and the pressure drop gradient is linearly related to the number of flow channel units. The fluid in the mainstream area is updated quickly, and is not prone to sedimentation. The vortex area of the flow channel and the chamfered parts of the storage tank are the main parts where sedimentation occurs.The turbulent kinetic energy is lower in the vortex region of the channel and the chamfering part of the water storage tank than in the other regions of the channel, so the turbulent flow can not be formed or maintained, which is not conducive to sediment transport, thus forming a plug. The simulation results show that, the analysis of flow velocity, turbulent kinetic energy and streamline in the inner structure of the emitters shows that the low velocity zone and the chamfer and side wall of the storage tank are the main locations of sediment deposition in the emitters.