Abstract: Abstract：[Objectives] This paper aims to study a torsional vibration isolator with high-static-low-dynamic characteristic, in order to solve the disadvantages of traditional linear vibration isolator in low-frequency vibration isolation. [Methods] Firstly, the components based on the parallel connection of positive and negative torsional stiffness are designed, and the isolator model is build by the SolidWorks software, which is manufactured through 3D printing. Then the model is conducted by finite element simulation and analyzed by static load torsional test. Finally, the Duffing equation of the model is solved by using the harmonic balance, which aims to study the influence of structural parameters and excitation amplitude on the torque transmissibility of the isolator. [Results] During the static test, numerical theory has verified the effectiveness of the vibration isolator with quasi-zero-stiffness within the range of -2o~2o, and a high linear stiffness outside the range of -2o~2o. The torque transmissibility analysis verified that the vibration isolator has better low-frequency with appropriate structural parameters. [Conclusions] The torsional vibration isolator achieves high-static-low-dynamic characteristics through parallel connection of positive and negative stiffness, which has ability of low-frequency torsional vibration.