Planning craft, whose weight is predominantly supported by hydrodynamic lift, has the advantages of lower resistance and faster speed. It is widely used in various scenarios such as entertainment, rescue and military applications. The amplitudes of the pitch and heave in the sliding state during the sailing of the planning craft are higher than those of the traditional displacement ships, especially, periodic exit and entry similar as jumping phenomena will occur when the planning craft travels in waves. Compared with traditional displacement ships, the planning craft has larger amplitudes of the pitch and heave when it travels at the sliding state, especially, periodic exit and entry similar as jumping phenomena will occur when it travels in waves. The resistance, propulsion and seakeeping performance of a deep-V planning craft (generic prismatic planning hull, GPPH) are numerically simulated by using a self-developed dynamic overset grid technology combined with the open-source CFD library OpenFOAM. The comparison between the numerical calculation results and the model test results shows that the dynamic overset grid technology can better capture the large pitch and heave of the planning craft. The periodic exit and entry of the hull generate large periodic slamming pressure on the bottom of the ship, and the numerical calculations can also provide reasonable predictions of the pressure.