：Using the idea of phononic crystals, the ship hydraulic pipeline isolator is designed to be a one-dimensional periodic structure which is composed of metal and rubber. The vibration of ship hydraulic pipeline can be controlled by the band gaps properties of the isolator. The band structure and FRF of the isolator is calculated by the transfer matrix method and finite element method, respectively. The influence of material properties, lattice constant and fineness ratio to the frequency ranges and the width of the band gaps is also be considered, and the best structure parameters are obtained. By combing the numerically calculations and experimental measurements, the results indicate that the isolator has longitudinal vibration band gaps at low frequencies form 600 Hz to 10 000 Hz, and the isolator could control the vibration of ship hydraulic system transferring form pipeline to ship hull structures effectively. The research provides a new technical way for vibration control of ship hydraulic pipeline.