In this study, EBSP (electron backscatter diffraction pattern) method was applied to evaluate changes in crystal orientation during creep deformation. The tested material was Ni-base superalloy, Hastelloy X, and creep tests were conducted at 1123K under the stress of 49MPa. Two different phenomena, which were the change of misorientation in each grain and the change of grain orientation distribution, were observed. Degree of the misorientation increased with creep damage and especially showed a good correlation with creep strain larger than about 5%. The change of the grain orientation distribution showed that grains having the crystal orientation of <101> toward the stress axis decreased with creep damage, while <001> or <111> increased. These two different phenomena were quantitatively correlated with creep damage by several parameters and these parameters were thought to be effective for the evaluation of local damages of heat resisting metals.