Sandstone is composed of detrital composition and interstitial material, in study area.Mineral debris mainly composed of quartz, feldspar and muscovite, in addition to small amount of epi—dote, tourmaline, magnetite, pyrite, garnet and zircon, etc.The rock debris are mainly composed by siliceous debris, mud debris, slate debris and phyllite debris.The interstitial material includs matrix and cement.It is found that matrix can further be subdivided into protomatrix.orthomatrix. pseudomatrix and the cements are mainly calcareous and muddy.The resoults shows that type of sandstone rock, in Xujiahe Formation of Huangjinkou exploration area, is mainly lithic sandstone, fol—lowed by lithic quartz sandstone and a small amount of quartz sandstone.