The deposition of particulate matter in heat exchanger channels can greatly reduce their heat transfer efficiency, and a better understanding of the deposition characteristics of particulate matter in heat exchanger channels is essential for improving heat exchanger performance. The deposition characteristics of particles in a three-dimensional dimpled dimple channel were simulated using the Reynolds Stress Model (RSM) and Discrete Particle Model (DPM). The flow structure, secondary flow , temperature distribution and particle deposition distribution in the dimpled dimple channel were analyzed and investigated after mesh -independence testing and numerical validation. The results showed that the main mechanisms affecting the particle deposition characteristics in dimpled dimple channels were gravity , thermophoretic forces , turbulent flow structure , secondary flow and particle inertia , and the effects of these mechanisms change significantly with particle size. For small particles ( dp<10 um) , the presence of the dimpled dimple structure promoted deposition; however, for large particles ( dp>10 um ) , its presence had only a small effect on the distribution of particle deposition locations.