An experiment study oil eresion resistance of 4 kinds of wearproof coating material and No.2 carbon steel is presented here.Their computation formulae for relative weight crosion rate and relative volume enosion rate are obtained by virtue of theoretical analsis and numerical regression for their testing data. Compared with No. 20 carbon steel, one kind of wearproof coating material turns out to be superior in erosion - resistance. Moreover. it has such good manufacturability and maintainability that it has a bright prospect of being applied to power plant boilers in which high-ashfuel is used.