Abstract: At first, this paper gives a brief review of early research history in the study area, especially on the details of first discovery of this locality by C. C. Young. Secondly, the geological setting of the Xiejiahe basin is briefly discussed, and the Miocene stratigraphic sequences are described in detail, Thirdly, the sedimentary environments are analyzed and the status of paleoecological study is estimated, based on the analysis of different fossil assemblages, it is proved that the Xiejiahe basin was in a humid and warm climate during the Miocene period, associated with some volcanic activities. At last, a comparison among the Clarkia basin, Idaho, USA, Steinheim crater, Germany and study area (Shanwang) is made, the similarities and differences of three areas above are discussed in this paper.