Reservoir characteristics and influences by diagenesis and sedimentary environment of the Qingshuihe clastic formation of Shinan area, Junggar Basin, are studied in this paper by SEM, casting thin sections, X-ray diffraction, combining geology logging and well logging data, providing a theoretical guide for further exploration and development. The results show that the Qingshuihe Formation in the region of interest was developed in braided river front subfacies, of which the lithology includes grey medium-coarse-grained sandstone and medium-fine-grained sandstone with which some grey siltstone and grey silty mudstone were mingled. In the process of diagenesis, compaction caused about 60% of the primary pore loss, and cementation caused about 20% of the primary pore loss. The physical properties of Qingshuihe Formation are principally controlled by sedimentary environment, on which the influence of diagenesis is small.