  The first study of the dissociation temperature of nucleon in hot QCD medium
in the framework of constituent quark model is presented. The
temperature-dependent potential energy of the three quark system, taking as the
internal energy of the system are obtained from the free energy of the system,
and the temperature-dependent free energy is derived based on Debye-H\"uckel
theory. The lattice QCD results of the free energy for heavy three-quark system
are employed and extended to the light three-quark system. The Schr\"{o}dinger
equation for nucleon is solved with the help of Gaussian expansion method and
the dissociation temperature of the nucleon is determined according to the
temperature dependence of binding energy and radii. Comparing with the
dissociation temperature of $J/\psi$, the dissociation temperature of nucleon
is higher. So, nucleon is more difficult to melt than Charmonium.
