Abstract: Through rock elements content analysis, the original rock of metamorphic rock has been analyzed and the types of it are varied. Through three-axis stress experiment, the compression and shearing resistance properties of different lithologies in Archaeozoic bedrock inside have been determined, the rock fragmentation under different conditions has been analyzed and then the "superior lithology sequence" under the conditions of pressure stress and shearing stress has been established. Testing data indicates the reservoir development of Archaeozoic bedrock is mainly controlled by external stress and the rock characteristics itself. Under the normal stress condition, the rock fragmentation is mainly affected by the dark mineral content, the less the dark mineral content, the more easily rock fragmentation and more easily reservoir formation. Under shear stress condition, rock fragmentation is mainly affected by rock structure of the non-uniform sex determination, the stronger the structure of the heterogeneity, the more easily rock fragmentation. From the rock compression and shearing resistance, rock fragmentation is more likely to form reservoir under shearing stress conditions.