Bauxite of the Benxi Formation at the YanshiLongmen area, Western Henan, is an important component of bauxite mineralization province in the south of North China Block. Like other karst bauxite in the world, its material source is still in big controversy. In this paper, two representative samples of pisoliticoolitic (clastic) bauxite and bauxitic mudstone were selected to conduct LAICPMS detrital zircons UPb dating analysis with in situ LuHf isotope analysis for determining material sources and its properties. The result shows that the detrital zircon U-Pb ages of the samples from the Yanlong area can be divided into two groups：the first group accounting for 73% has an age of 378~544 Ma with the peak about 443 Ma, corresponding to Caledonian age except for one zircon age of 378 Ma; and the other group accounting for 27% is in the range of 629~3113 Ma with three significant peaks at 992 Ma, 1817 Ma and 2500 Ma, corresponding to SibaoJinning Period, Lvliang Period and Wutai Period respectively. Detrital zircons of Caledonian and SibaoJinning Period show prominent features of magmatic zircons; whereas detrital zircons of Lvliang Period and Wutai Period are mainly metamorphic growth magmatic zircons. The detrital zircons of Caledonian and SibaoJinning Period (accounting for 85.3% of all the detrital zircons) derived from the North Qinling Orogeny, and minor amount of detrital zircons of Lvliang Period and Wutai Period (accounting for 6.4% of all the detrital zircons) probably derived from the karstic insoluble matters of Majiagou Formation limestone underlying the Benxi Formation.