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The fundamental equation of the thermodynamic system gives the relationbetween internal energy, entropy and volume of two adjacent equilibrium states.Taking higher dimensional charged Gauss-Bonnet black hole in de Sitter space asa thermodynamic system, the state parameters have to meet the fundamentalequation of thermodynamics. We introduce the effective thermodynamic quantitiesto describe the black hole in de Sitter space. Considering that in the lukewarmcase the temperature of the black hole horizon is equal to that of thecosmological horizon, the effective temperature of spacetime is the same, weconjecture that the effective temperature has the same value. In this way, wecan obtain the entropy formula of spacetime by solving the differentialequation. We find that the total entropy contain an extra terms besides the sumof the entropies of the two horizons. The corrected terms of the entropy is afunction of horizon radius ratio, and is independent of the charge of thespacetime.

Entropy of Higher Dimensional Charged Gauss-Bonnet Black hole in de Sitter Space