Abstract: The Lower Cretaceous Bashijiqike reservoirs in a gasfield of Kuqa depression in Tarim basin belong to a typical low?permeability and fractured tight sandstone reservoir. Their fractures have complex origin and evolution history due to a multistage tectonic movements experience, large burial depth and many interbeds. The fractures in them not only play an important role in oil and gas migration as the main effective pathway, but also a significant impact factor on the reservoir stimulation by hydraulic fracturing. The main methods (including medical CT) for fractures description or characterization have disadvantages of low identification precision and poor quantitative assessment effect. In this paper, ICT (Industrial Computed Tomography) technique is used to scan and image the inner fractures in core samples from the fractured tight sandstone reservoirs in this gasfield, based on which the systematically study is carried out on the shape, occurrence, filling feature, spatial combination and origin classification of the fractures. The result shows that the fractures occurred in this study area are dominated by high?angle tectonic fractures, including extension one, shear one and multistage mixed one given by mechanism analysis. The type of fractures can be divided into linear, broken line, complicated network, wheat?like and broom?like ones. And the lots of fractures have complex “multilayer filling structure”that is discovered for the first time. The porosity of fractures in these reservoirs by the ICT analysis mainly ranges from 0.01% to 0.04%