Ancient earthquake are determined by various sediment deformation structures contained in the strata. The systematic induction and summarization of the sediment deformation produced by earthquakes will provide the theoretical basis for ancient seismite researches, and is helpful for recognizing those signs in the field. The classification of sediment deformation brought by earthquakes introduced here is a draft to be discussed, supplemented and revised. The genesis mechanism is the bedrock of classification. Though these special sediment deformation structures are mainly related with earthquakes, many other factors may also be included. Therefore, detailed researches of regional geological setting shall be performed for determining the deformation structures.