  We study and derive the energy conditions in generalized non-local gravity,
which is the modified theory of general relativity (GR) obtained by adding a
term $m^{2n-2}R\Box^{-n}R$ to the Einstein-Hilbert action. Moreover, in order
to get some insight on the meaning of the energy conditions, we illustrate the
evolutions of four energy conditions with the model parameter $\varepsilon$ for
different $n$. By analysis we give the constraints on the model parameters
$\varepsilon$.
