The influence of parameters such as fluid velocity, particle size, fluid viscosity, and fluid density on the erosion behavior of blind passages was investigated using computational fluid dynamics (CFD). DPM model was used to calculate the trajectory of solid particles in blind pass, and the effect of particle movement on erosion corrosion rate in blind pass was analyzed.Explore the optimal structure of blind⁃pass pipe to reduce erosion corrosion, and compare the influence of blind⁃pass length on erosion corrosion.The numerical simulation results show that the serious erosion corrosion area is mainly located at the location of inner arch of the blind⁃through pipe. As the fluid velocity increases, the erosion corrosion behavior intensifies, and the erosion corrosion behavior weakens due to the increase in particle size and the viscosity, and the erosion corrosion behavior was the weakest when the blind pass length was 45 mm.