Abstract: A kind of nickel-base single crystal superalloy was prepared by the screw selecting method in a directionally solidified furnace. The effect of standard blade check corrosion on the tensile properties at 980 ℃ and stress rupture properties at 980 ℃/250 MPa of the single crystal superalloy was investigated, and the surface microstructure and ruptured microstructure of the specimen was analyzed by SEM. The results show that the corrosion depth in the inter-dendrite region was deeper than that in the dendrite core during the corrosion process. With the increase of corrosion times, the surface roughness of the alloy increased. Some corrosion pits or grooves were formed in the inter-dendrite region. The tensile properties and stress rupture properties of the alloy decreased after check corrosion.