Single crystals of pure copper were tensile-deformed along h011i-and h001i direction and then annealed to study their deformation and recrystallization behaviors. In the h011i single crystals, no large-scale deformation band was formed. The areas where the secondary slip was activated were small and were randomly distributed throughout the deformed crystals. Large rotation with respect to the initial orientation was found. After annealing, many recrystallized grains were formed. In the h001i single crystal, because of almost equal activation of eight slip systems on four slip planes, orientation change associated with deformation was very small. Large-scale cross-slip was completely suppressed. As a result, the work-hardening of the h001i single crystal was very large. After annealing, large primary recrystallized grains were formed. The above results are compared with those of aluminum single crystals having the same tensile orientations.