Abstract: After many studies on geochronology, geochemistry and petrology of the eclogite from Bixiling have been done, its formation and metamorphic history are well known now. However, little work about elements and isotopes changes during the UHP metamorphism was conducted. The garnet Pb isotopes from Bxiling eclogites were studied by the stepwise-leaching technique in this paper. The Pb isotopic compositions obtained by different individual steps are various; However, the evolution trends of Pb isotopic compositions of different garnets and different progresses are almost consistent. The Pb-Pb ＂isochron＂ ages are about 3 billion years ,which are different from the ages of protolith formation and UHP metamorphism obtained by precursors. Although the ages perhaps have no geologic significance, the results of stepwise-leaching may reflect that Pb isotopic compositions of the eclogite from Bixiling are mixture of materials from mantle and upper crust. In brief, the protolith of the eclogite was originated from mantle materials, and during rapid exhumation after the Triassic collison, the eclogites were matesomatized by the hydrous fluid with the upper crust Pb isotopic compositions.