(001) γ-LiAlO2 plates grown by temperature gradient technique (TGT) have been annealed in Li-rich and O2 atmosphere at 1100 ℃/70 h. The surface structure, morphology and absorption spectra were investigated through scanning electron microscopy, X-ray diffraction, spectrophotometer at room temperature. Compared to the plate annealed in Li-rich atmosphere, the surface of the plate annealed in O2-atmosphere became coarse and grew Li-poor polycrystalline (LiAl5O8). With the all spectral analysis, it is confirmed that the 196 nm absorption peak is probably caused by Li vacancies in the plate.