Abstract: In order to study the “shock effect” on the dynamics of the twobody rope satellite system，a flexible rope model based on the absolute nodal coordinate formulation（ANCF）and the equations of motion of the tethered satellite system were established.Firstly，the establishment process of the flexible rope model based on the ANCF was introduced，and the axial stiffness matrix，bending stiffness matrix and mass matrix of the flexible rope were fully considered in the simulation，which can retain the true characteristics of the rope system without increasing the amount of calculation.Finally，a 3-degree-of-freedom ground simulation experiment system of two-body rope satellite was built，and the verification experiment on a large air-floating platform with a specification of 20m×30m was carried out.The tension of the tether and the motion state of the sub-satellite during the final release phase and the initial recovery phase was analyzed in this experiment.The validation results indicate that the error of the tether tension is within 5% in the ground simulation test compared with the simulation experiment，which verifies the validity of the modeling method and the reliability of the experimental system，and provides support for the future development of the tether satellite and the ground experiment.

Key words: absolute nodal coordinate formulation, tethered satellite, dynamics modeling, shock effect, test verification