A novel linear hydraulic motor driven by piezostack pump (piezohydraulic motor) was presented, and its structure and working principle were introduced. With establishing the static-state model, the influence factors of the piezohydraulic motor were picked up and analyzed. The theoretic results show that the output capability of the piezohydraulic motor depends on the structure and size of the piezostack/pump-chamber/check-valve/cylinder, the driving frequency and even the external load. The desired performance of piezohydraulic motor will not be achieved unless the relative parameters are matched well. Moreover,when an applied load is equal to half of the blocking force, the maximal output power can be obtained. A piezostack pump with 30 mm chamber-diameter was fabricated using a piezostack in 4 mm×4 mm×80 mm,and the experiments on the unattached pump and the overall piezohydraulic motor were carried out for comparison on their flowrates, pressures and output powers. Analyzed results show that the maximal thrust, velocity and the power of the piezohydraulic motor are 32 N, 12.5 mm/s and 93 mW, respectively,when a cylinder with chamber diameter of 15 mm are utilized.