Entropy of the straightly accelerating non-stationary black hole

Selecting the advanced Eddington coordinates and adopting the thin film brick-wall model, we calculate the entropy of the straightly accelerating non-stationary black hole expressed by Kinnersley metric. The approach used in this paper can give temperature and the surface density of entropy at every point on the horizon. This result indicates that the conclusion that black hole entropy is proportional to its area can be applied to horizon not only globally, but also locally. The above conclusion is valid not only for stationary black holes, but also for non-stationary black holes. When the thin film approaches the horizon, the thickness of it also becomes zero and itself becomes the horizon. The black hole entropy is just identified with the entropy of the quantum field on the event horizon.