Nano_scale ZnO green disks are prepared by continuous compaction process. Relation between green density, sintering time, densification temperature and compaction method is examined. Microstructure of the samples is characterized by an XL30S_FEG field esmission scanning electron microscopy. Hardness of the ZnO nano_bulk is measured as a function of sintering temperature. The results show that gree n density is increased by 56%, sintering time is decreased by 3h and densifica tion temperature is decreased by 200℃ after the continuous compaction process. Distributions of density and grain size within the sintered body are homogeneous through examination of the XL30S_FEG field esmission scanning electron microsco py. Hardness values imply that the relation between micro_hardness and sintering temperature is not monotonic, but first increasing then decreasing with increas ing sintering temperature in the ZnO nano_bulk. The grain size at the inflexion point is about 50—60nm.