Seven pairs of coexisting ortho-and clino-pyroxene from granulites of var- ious chemical series in Qianan county have been researched, and the temper- aturepressure condition of Early-Archean granulite facies metamorphism of this area is discussed. The equilibrium temperatures of coexisting twopyroxene calculated accord- ing to Wood and Banno's methods (1973) and to We11's method (1977) were very close to each other, with an average value of 845土60℃.The pressure estimated by Ca/Ca+blg of ortho-pyroxene coexisting with diopside (Nehru 1976) and by the tschermakite content of clino-pyroxene coexisting with an- orthite and quartz (Wood 1976) were about 8Kb at that temperature. Corre- sponding to a geothermal gradient of 300℃/Km, early-Archean metamorphism of Qianan is approaching to a low pressure metamorphic facies series. The equilib- rium temperature of coexsting Garnet-biotite was 575-694 ℃. It is implied that these rocks have also undergone the superimposed retrograde metamor- phism of amphibolite facies.