Abstract: Pipe piles are the primary foundation form of offshore wind turbines, their dynamic response significantly impacts the stability and safety of the turbine system, and they have now become a prominent research area in the field of Marine geotechnical engineering. Theoretical studies on the dynamic response of pipe piles generally overlook the influence of internal and external hydrodynamic pressure, primarily focusing on the deterministic analysis that fails to fully capture real working conditions. This study extends the investigation from the deterministic analysis to stochastic analysis by considering both internal and external hydrodynamic pressures in a horizontal dynamic response model. The shear wave velocity, particle density, and Poisson's ratio were set as random variables to study their effects on the stiffness and damping characteristics of core dynamic parameters for pipe piles concerning their values and dispersion. The sensitivity of random parameters to dynamic response is quantified, and the effect of random parameters on response fluctuation under specific excitation frequency is quantified. The primary conclusion is that the shear wave velocity exerts the most significant influence on both the mean value and dispersion of the dynamic response of the pile, thereby affecting the fluctuation of dynamic stiffness and of dynamic damping at specific frequencies. These research findings can serve as a valuable technical and theoretical reference for the design optimization of offshore pipe piles.