  Some essential conceptual aspects that will fill some logical gaps of the
frame to interpret the gravity as an entropic force was investigated, we focus
on some crucial issues that didn't emphasized in Verlinde's original
paper[arXiv:1001.0785]. This note explains the context that holographic screen
can be endowed with an entropy that proportional to it's area and the meaning
in using equipartition law in spacetime thermodynamics, thermodynamic
quantities such as entropy and temperature are observer dependent is the
crucial concept in explaining those problems. Coarse graining will leave
information in the gravitational potential, which will connect different
observer's point of views for the same object. This will help us to understand
the coarse graining dependent definition of entropy and the nature of
spacetime. It also indicates the way that entropy bounds work, which is
consistant with Bekenstein entropy bound and holographic entropy bound.
