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Petrography of sandstones,major,trace,and rare earth element compositions of mudstones from the Late Paleozoic Shihezi Formation in the East central of Ordos basin,China,have been investigated to determine their provenance and tectonic setting.Petrologic studies demonstrate that all sandstone samples from Shihezi Formation are highly enriched in quartz (Q) but poor in lithic fragments and feldspar (F).The sandstone samples consist mainly of lithic quartz sandstone and litharenite with abundant metamorphic and volcanic fragments.On Q-F-L plots sandstones fall into the field of recycled-orogenic source,which is the same as the report from Chen et al.(2012).