Chinese loess is unique in having great scientific value and also playing an important role in societal development. Large volumes of loess are carried by the Yellow River from the Chinese Loess Plateau to the Bohai Sea， northeast China， forming the Yellow River delta. However， compared to the well-studied Chinese Loess Plateau， our understanding of the change of the geotechnical properties from land to sea is not enough. Consolidated undrained dynamic triaxial strength tests of soil samples collected from tidal flats with different depositional ages are conducted under isotropic consolidation condition， and strain failure criterion was used. Based on the experimental results， the dynamic strength curves and the dynamic pore water pressure developing curves were obtained.Meanwhile，the basic development equation of pore pressure is established. Considering that the Yellow River Delta is formed by large volumes of loess carried by the Yellow River from the Chinese Loess Plateau， northeast China， the similarities and differences between estuarine loess and land loess are disscussed. Our results show that at the end of the tests， the residual pore pressure has a finite value， but the residual strain keeps on developing. And the development of pore-water pressure of both land loess and estuarine loess can be described by a five polynomial under isotropic consolidation. However， the estuarine loess is less susceptible to liquefaction than land-derived loess. The results of this study has implications for hazard mitigation and improves our understanding of the mechanisms responsible for loess-related geological disasters.