Abstract: The special three-dimensional construction of warp knitted spacer fabric is analyzed to look into the viscoelastic nature in the static and dynamic condition and to study the mechanical properties of this new cushioning material for car seats.A mechanical model is built up and vibration transmission rate is used to describe the vibration behavior.Natural frequency and damping coefficient are the important parameters which are determined by the construction parameters of spacer fabric.The analytical results show that the construction and material of spacer layer are the key factors which influence the vibration behavior.The natural frequency and damping coefficient can be predetermined by rational designation of construction parameter to optimize the spacer fabric′s vibration behavior and riding comfort.