Abstract: The erosion wear test of austenitic stainless steel A182F347 was carried out in a homemade rotary liquid-sol- id two-phase flow erosion test device with different impact angles,erosion velocities and slurry concentrations,and the SiO2 and Al2 O3 abrasive particle with a size of 150 μm. Based on the specimen surface erosion morphology analysis, the erosion mechanism of austenitic stainless steel A182F347 under the liquid-solid two-phase flow system was re- vealed. The results show that the impact angle has an approximate effect on the erosion of specimens under the 4% -8% slurry concentration. The erosion rate reaches maximum when the impact angle is 60°,and at the peak areas on both sides,the wear rate gradually decreases. Slurry concentration is 6% ,the impact velocity increases from 1. 65 m / s to 3. 85 m / s,and the speed index decreases with the increase of impact angle. Under the high flow rate,the impact an- gle of 60° and slurry concentration less than 6% ,the specimen wear rate is less affected by the concentration of slurry. When the slurry concentration is greater than 6% ,the higher the concentration,the greater the wear rate. Under the low flow rate,slurry concentration is greater than 8% ,the specimen wear rate is less affected by the concentration of slurry. The erosion mechanism of A182F347 is that the furrows cutting wear is predominant at low angles,and the forging distortion wear is dominant at high impact angles. There is a good qualitative agreement between the established mathematical model and the test results.