Based on observation and analysis of samples from outcrops, drilled wells, and seismic data interpretation, it is indicated that controlled by sedimentary environment in deep shelf, the Upper Ordovicain Wufeng-Lower Silurian Longmaxi shales are widely developed and distributed in the north of Dangyang Synclinorium, Hubei province. The organic-rich black shale is about 50m thick. The kerogen type isⅡ2 .The content of organic carbon is generally more than 2,. The Ro is about 3,, which means the shale is in overmature stage.Shale is mainly composed of quartz and clay, which is useful for pressure-fracturing of shale reservoirs and gas enrichment. The shale reservoirs are characterized by low porosity and extra-low permeability. The simple synclinorium structures and the regional overlying cap provide the good preservation condition for shale gas. The resources calculation has indicated good resources potential in this area. Through the overall geological evaluation, it is suggested that the Xunjian-Xiqian synclinal zone and the Longping-Xiaoyan-Lixi anticlinal zone are the favorable potential areas of prospecting shale gas.