The slab photonic crystal liquid crystal micro-cavity is formed by introducing liquid crystal defect whose thickness equalizs to the light wavelength into the center air hollow of planar photonic crystal. The temperature properties of liquid crystal micro-cavity are investigated using the finite difference time domain (FDTD), and calculated by Matlab. The results show that the resonant wavelength moves into long wavelength, defect mode width decreases, quality factor increases as temperature increases, the change curve of resonant wavelength and quality factor with filling factor and slab thickness move into large. The temperature properties change rapidly near the liquid crystal clear point. Temperature properties of slab photonic crystal liquid crystal micro-cavity provide a theoretical basis for design of tunable photonic crystal device.