Entropy of Schwarzschild-de Sitter black hole in non-thermal-equilibrium

Starting from the Klein-Gordon equation, we calculate the entropy of Schwar zschild-de Sitter black hole in non-thermal-equilibrium by using the improv ed brick-wall method-membrane model. When taking the proper cutoff in the o btained result, we obtain that both black hole's entropy and cosmic entropy are proportional to the areas of event horizon. We avoid the logarithmic t erm and stripped term in the original brick-wall method. It offers a new wa y of studying the entropy of the black hole in non-thermal-equilibrium.