Thermodynamic Properties of a Reissner-Nordstrom Quintessence Black Hole

The first law of thermodynamics for the three horizons of Reissner-Nordstrom quintessence (RNQ) spacetime is obtained. For a general process of RNQ spacetime, the expressions for the radius changes of the three horizons are derived. When only mass changes, the heat fluxes through the three horizons are equivalent and no heat is left in the black hole region. Finally, a further discussion on the thermal properties of an RNQ black hole is given.