为了解滇西永平盆地上新世时期的古气候特征及沉积环境特征，开展了对永平盆地上新世三营组沉积物的沉积相、植物化石、孢粉和介形虫等方面的研究工作。通过对植物化石和孢粉研究可知：高山栎组植物占绝对优势，为优势种，同时采用共存因子分析法定量恢复了永平盆地上新世古气候，其古气候特征总体为凉爽湿润。对三营组沉积物沉积特征和介形虫分析研究显示，三营组沉积相在纵向上变化明显，早期河流三角洲相广泛发育，沉积晚期以湖（沼）相为主。沉积物中介形虫主要生活在上新世时期，其生长环境主要为比较清洁、安静的湖泊水中。% Absract:Yongping basin was studied by sedimentary facies,plant fossils,Pollen and ostracods analysis,to unders-tand the characteristics paleoclimate and depositional environment during Pliocene of Yongping basin in western Yunnan. According to plant fossils and pollen analysis,it showed that the alpine oak group plants were the dominant species. The Coexistence Approach analysis indicated that the characteristics of paleoclimate during Pliocene of Yongping basin was cool and humid. Besides,the late sedimentary characteristics mainly appearing river delta phase in the early period,and lake(marsh)phase in the late period. The period of ostracods in the sediment mainly lived in the Pliocene period,and the growth environment was clean,quietlakewater.
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