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Normal��reverse and oscillatory zonings are commonly developed in clinopyroxene phenocrysts in Gemucuo Oligocene alkaline potassic volcanic rocks from Qiangtang area��North Tibet��and most of them have the characteristics of“green- core clinopyroxenes” �� The electron probe results show that the cores of“green- core cli- nopyroxenes”have high Mg # and low Mg # components��and both of which have sieve- like erosion structure�� The zoning structure mainly developed on mantle and rim of pyroxene��which has a significant intermittent to the green core�� The composition of mantle ranges relatively narrow�� The composition and structural characteristics of these “green- core clinopyroxenes” reflect the homologous alkaline potassic magma experienced replenishing- mixing process in crustal magmatic chamber��and the complex zoning structure records the crystallization process of mixed magma��