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This paper proposes a new type of jetting dispenser driven by a piezostack actuator. After describing structural components of the dispensing mechanism and operating principle, a dynamic model of the dispenser is analytically formulated by considering dynamic behaviors of the piezostack-piston head and the ball-needle. The inelastic impact between the ball-needle and the ball-seat during dispensing process is also considered in the modeling. An analytical fluid-solid interaction model is then derived by integrating the dynamic behavior of the dispensing fluid. Dispensing performances such as dot size and flow rate are evaluated under various frequencies and amplitudes of the sinusoidal driving voltage applied to the piezostack actuator.