Statistical entropy of the A torus-like black hole

By using the method of quantum statistics, we directly derive the partition functions of the bosonic and fermionic fields in the A torus-like black hole. Then via the improved brick-wall method, the membrane model, we obtain that the entropy of the bosonic and fermionic fields in the black hole is proportional to the area of the horizon. In our result, the stripped term and the divergent logarithmic term no longer exist. The problem that the state density is divergent around the horizon does not exist either. We also give the influence of the spining degeneracy of particles on the entropy of the black hole. We offer a new simple and direct way of calculating the entropy of different complicated black holes.