  We have studied the temperature dependence of the rate of energy transfer
from electronic sub-system to phononic sub-system in the case of cuprates, when
the system is photo-excited by a femtosecond laser pulse. In the pseudogap
state, taking the electronic dispersion {\it as linear} near the nodal points
of the Brillouin zone, we show that the rate of energy transfer from electronic
sub-system to phononic sub-system is proportional to $T^{5}$ at lower
temperatures ($T<<T_0$), and is proportional to $T$ at higher temperatures
($T>>T_0$), here $T_0$ is the Debye temperature for cuprates. The linear
electronic dispersion in the pseudogap state introduces new terms in the
expression of energy transfer as given by M. I. KAGANOV et.al. \cite{kaganov}.
{\it But the leading terms are the same which are found in the case of metals
in the above reference.} The electron-phonon relaxation time follows $T^{-3}$
law for cuprates which agrees well with the experimental results
\cite{demsar,Jdemsar}.
