Abstract:Pillow structure and ballandpillow structure are the softsediment deformation within strata. They are different in morphological feature, mode of occurrence and mechanism of deformation. Pillow structure consists of a suit of deformed concave upward bodies made of silt and sand whose original layering bent round parallel the basal surface and it truncated at the top surface. The formation of pillows was initiated by the liquefaction of some definite layers within package of layered sand that was forced to fold as a result of upward flow of the liquefied sand at more or less regularly spaced sites. For these reason, the pillows occur intervals across single layered sand beds to forming a series of laterally connected synform (width) and antiforms(narrows). Softsediment layer of load, ballandpillow involves the fine sand unit and the overlying coarse sand unit. The mechanism of deformation is related to liquefaction and fluidization processes. The finesand unit displays active liquefied deformation features while the overlying sands show mainly passive deformation feature (hydraplastic deformation). The superposition of coarsegrained sand (heavy) on finegrained sand (light) represents a driving force system related to gravitational instability. The heavy sand may sink into the light sands forming load cast, ballandpillow and they retained primary lamination of the overlying coarse sand unit. The ballandpillow are located different position in the fine sand indicating that they dropped through the fine sand unit. Liquefaction and fluidization was triggered by a strong paleoseismic event. Pillow and load, ballandpillow structure are similar to those obtained experimentally at liquefied sand subjected to shaking. Deformation of pillow, ballandpillow, load structures represent a paleoseismic records of Ms>5 within strata originating along some paleoseismic fault. Some ancient examples of China are discussed in this paper.