The work aims to study erosion of pipe by ice particles in water flow at low temperature and confirm critical pro-tection regions of the elbow. The effects of Stokes numbers, velocity, particle diameter, mass flow rate and R/D ratio on erosion characteristics were studied through two-way coupling method of euler and lagrange. The Stokes number of ice particles had a significant effect on the regions with the maximum erosion rate. When the Stokes number increased from 2.8 to 5.84, the location with the maximum erosion rate region was transferred from inner extrados of the bend to outer extrados of the bend close to straight pipe. When the Stokes number was higher or lower than that range, the location with the maximum erosion regions did not change at all. The increase of Stokes number had no obvious effect on the maximum erosion rate within a certain range. As the velocity, particle diameter and mass flow rate increased, the maximum erosion rate grew. The variations of particle diameter and velocity changed the location of with the maximum erosion rate regions, but the mass flow rate had no obvious effect on the location of maximum erosion rate regions. The growth of R/D ratio also caused the location with the maximum erosion rate to shift from inner extrados to outer extrados of the bend, where it was close to straight pipe and the maximum erosion rate decreased. The regions with the maximum erosion rate of ice-water two phase flow elbow are mainly concentrated at three zones: inner extrados of the bend, outer extrados of the bend close to straight pipe and the side wall near the elbow. Furthermore, erosion rate can be reduced by a long R/D ratio elbow.