Abstract: When hill orchard spiral ditcher is working, but there are rocks and foreign matters in orchard soil, its ditching blades will abrase quickly. The operation process of hill orchard spiral ditcher and shield machine is very similar. It is worth trying to replace the original ditching blades with carbide ditching blades. Because severe abrase at the teeth of blade, therefore replace its material with YG11 C from H13 and blade thickness is increased. Using oxyacetylene flame for surfacing WC welding electrode on the upper and lower surfaces of blade body. Abrase bench test and field test show that in terms of abrase resistance, carbide blades are best, original blades are worst, and mending carbide blades are between carbide blades and original blades. It’s feasible to repair carbide blades using wire cutting technology and Brazing technology. After 60 minutes of abrase bench test, abrase weight of carbide blades and mending carbide blades are 65.44% and 62.65% less than that of original blades. And differences of hardfacing types on abrase resistance are adjacent normal＞adjacent tangent＞spaced reticulum ＞spaced normal＞spaced tangent. Density and direction have influence on abrase resistance. Density types of adjacent is better than spaced, and direction types of normal is better than tangent on abrase resistance. Spaced reticulum hardfacing has good comprehensive performance therefore it is suitable for large area surfacing.After 4 hours of field test, abrase weight of carbide blades and mending carbide blades are 60.53% and 54.67% less than that of original blades. The study provide a reference for optimizing the abrase resistance of ditching blades.