According to the study of PC 5794 columnar sample (147一695cm, early period of Early Miocene) from Fast Pacific Pasin in such aspects as oxygen isotopes , biogenic CaCO3，paleotemperature and ore-forming elements, the region had the following features in the early period of Early Miocene: δ180 values of sediments might be roughly divided into five groups;paleoclimate experienced cold-warm alternations composed at least of three warm periods and two cold(ice)periods; oxygen isotopes were in direct correlation with biogenic CaCO3;Nn、Fe、Co、Ni were in negative correlation with δ180 values but Cu in direct correlation with paleotemperature.