Charnockites in Qianan-Qianxi area, Eastern Hebei province, range from intermediate to felsic end members in chemical composition. Al2O3, TFeO, CaO, Na2O and TiO2 decrease in a linear fashion with increasing SiO2. The trends indicate that the source rocks of charnockites are mainly igneous rocks. Geochemical and field data indicate that the igneous reeks were transformed into charnockite protoliths by partial melting. In the course of partial melting the garnet, hornblende and plagioclase were important mineral phases. The degree of hornblende and garnet fractionation played an important role for the fractionation of light and heavy REE, on the other hand, plagioclase and hornblende affected mainly Eu behaviour in the charnockite protoliths. Charnoekitism (granulite facies metamorphism) took place right after the emplacement of the charnoekite protoliths, during the charnorkitism, rich-CO2 fluid extracted large ion lithophile(LIL)elements and H2O from the charnockite protoliths, consequently, hydrogeneous minerals (biotite and hornblende) were dewatered and transformed into anhydrogeneous minerals (hypersthene and diopside), eventually, charnockites were formed. The charnockites in the north part of this area deplete large ion lithophile elements and REE content is lower, whereas, the chacnockites in the south part of the area are enriched these elements and REE content is higher. The differences are related to both of the composition of the protoliths and fluid discharge and CO2/H2O ratio in the fluid resulted by the emplacement of the protoliths in differently tectonic conditions.