The relation between gravity and thermodynamics has been a research focus in physical society for 40 years. In a recent work, we present a new view on this relation. We can derive Schwarzschild solution from thermodynamic considerations [7]. There are two key points in our demonstrations: The first one is an adiabatic Misner–Sharp system, and the second one is the surface gravity defined according to the unified first law. In this paper, we gener-alize this investigation to the case of modified gravities, and obtain some new results in modified gravity.