Abstract: The horizontal dynamic model of partially exposed floating pipe pile is established by the corresponding soil under pipe pile as virtual soil pipe pile, and the dynamic interactions between the soil around the pile and pipe pile, between pile core soil and pipe pile are described by the Winker spring-damper model. By solving the horizontal vibration of the soil around the pile and pile core soil, the horizontal action of the soil around the pile and pile core soil on the partially exposed floating pipe pile is obtained. The horizontal dynamic impedance of the partially exposed floating pipe pile is obtained by the initial parameter method and the transfer matrix method. The results of numerical analysis show that the influence of the boundary condition at the end of the pile on the horizontal dynamic impedance of the partially exposed floating pipe pile is not significant when the thickness of the soil layer under the pile is small. The length of the exposed part affects the change rule of the real part and the imaginary part of the horizontal dynamic impedance varying with the frequency. The internal radius of the pipe pile (that is, the wall thickness of the pipe pile) and the shear modulus ratio of the pile to the soil have a great influence on the horizontal dynamic impedance of the pipe pile, and the influence law at low frequency is related to the frequency.