Abstract: The water content of different layers is various in a typical high loess-filled foundation.The water content of some layers even comes to 50%, which may greatly affect the strain and stress state of the high loess-filled foundation under dynamic loading.Thus, it's necessary to study the dynamic strain and pore pressure of the compacted loess in the high loess-filled foundation.The compacted loess samples are made according to the actual dry density of the filled-loess foundation, then series of dynamic triaxial tests are conducted on the compacted loess samples subjected to different confining pressures and cyclic stress ratios.Based on the test results, the influences of cyclic stress ratio and cyclic number on deviatoric strain, deviatoric strain rate, deviatoric strain amplitude, pore pressure, pore pressure rate, and pore pressure amplitude are analyzed.The influences are further explored in the framework of the bounding surface plasticity theory.The conclusions are meaningful in analyzing the high filled-loess foundation under dynamic loading and in evaluating the deformation of the loess-filled foundation.