As part of the French Inertial Confinement Fusion program, Commissariat à l'Energie Atomique has developed cryogenic target assemblies (CTAs) for the Laser Mégajoule (LMJ) and a program in two stages for the permeation filling of these CTAs: (a) the permeation filling studies with the Study Filling Station cryostats and (b) the design and manufacturing of the whole operational chain of CTA filling facilities. This paper deals with the description of both the cryogenic studying and the filling facilities for the LMJ targets.