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Nanostructural ZnO ceramics was prepared using Al doped ZnO nano-powders by low-temperature HPing at 950°C for 3h. Al-doped ZnO nano-powders was obtained by chemical processing of both co-precipitation and spray drying at 120°C. Power factor of the prepared ZnO ceramics is 5.0×10-4 Wm-1K-2, which increased ca. 20% by HP sintering at 950°C. The prepared nanostructural ZnO ceramics showed lower thermal conductivity than that of normal sintered ceramics at the lower temperature range.