Abstract: The design and simulation of the longitudinal maneuvering motion prediction for the underwater smart ammunition were studied.The dynamic model of the underwater smart ammunition in the longitudinal plane were established.The standard and index evaluation methods of Z-shaped, trapezoidal and sinusoidal steering maneuverability of the underwater smart ammunition in the longitudinal plane were established and designed. At the same time, the matlab simulation examples were presented for each maneuvering motion prediction. The typical characteristic parameters of the maneuvering motion and their motion laws were analyzed and expounded. The simulation results show that the underwater smart ammunition has good rudder responsiveness and maneuverability, and the response time is fast, which can accurately predict the maneuverability of the underwater smart ammunition. The process and results of the maneuverability motion prediction analysis can also provide certain technical guidance and theoretical support for improving the structure and hydrodynamic design of the underwater smart ammunition.