Studies of sedimentary characteristics and genesis of the Miocene sediments in mid-Pacific Ocean have been very insufficient. Based on chemical analyses of samples collected from cores and surface sediments, this paper deals systematically with the spatial distribution of the elements and their variations since mid-Miocene. In order to reveal the associations of the elements, R-mode factor analysis for the main elements and trace elements in all samples by using softwares of Golden Grapher and SPSS.The sedimentary provenience and its environment have been discussed and the sedimentary model of Miocene sediments has been set up for the study area in mid-Pacific Ocean.