Abstract: Normal, reverse and oscillatory zonings are common in clinopyroxene phenocrysts in the Wozhong late Eocene high-Mg ultrapotassic lavas, western Yunnan province. Both the mantle of reverse zoning and the cores of normal zoning phenocrysts are all characterized by high Mg# values (0.83 ~ 0.90), low TiO2 (0.13 ~ 0.29 %), Al2O3 (0.73 ~ 1.68 %) and Na2O contents (0.22 ~ 0.42 %). They were equilibrious crystallization products from the host ultrapotassic lavas. The cores of reverse zoning phenocrysts are relatively low in Mg# (0.77 ~ 0.84), but have similar Ti/Al ratios (0.06 ~ 0.16) as the mantle of reversed zoning and the cores of normal zoning phenocrysts. The compositions of oscillatory zoning phenocrysts vary in the ranges of those for normal and reverse zoning phenoxcrysts. Consequently, it is suggested that these zoning phenocrysts were cognate affinity with the host ultrapotassic lavas. The reversed zonation discovers magma mixing process in the chamber in which a partially crystallized magma was replenished by a mafic magma, and oscillatory zoning denotes several episodes of such mixing process. The greencore clinopyroxene phenocrysts are very rare, in some samples are obviously low in Mg# (0.50 ~ 0.74) , relatively high in Al2O3 (1.66 ~ 3.63 %) and Na2O (0.87 ~ 2.17 %), very low in Ti/Al ratios (< 0.05) and high in AlVI/AlIV ratios (0.38~ 0.76). The green-core phenocrysts are interpreted as wall-rock xenocrysts from the lower crust, indicating the crustal contamination during magma evolution.