Dynamic antivibration isolators (DAVI) has been effectively used to remove undesirable oscillations from mechanical structures. The DAVI method has advantages such as large static stiffness, remarkable vibration isolation, and being efficiency in lowfrequency vibration damping. However, when the frequency of the external excitation varies, traditional passive DAVI can’t remain high efficiency all the time. Aimed at solving this problem, this passage proposed an active DAVI method based on the hill climbing algorithm, which tunes the system’s antiresonance frequency dynamically by moving a small mass according to the onlinemeasured force transmissibility The paper first introduces the tunable DAVI system and the control theory. Then, simulations are conducted using LabVIEW and the proposed theory is verified.