The objective of this work is to study the thermal and rheological properties of thermoset polymers, epoxy polymers cases, such as novolac and bisphenol A diglycidylether (BADGE). The macroscopic characterization epoxy resins Diglycidyl ether of bisphenol A and phenol formaldehyde epoxy novolac was made by the method of analysis of the rheological behavior of standard matrices before their cross-linking in order to determine their storage conditions. Both thermosetting matrices showed high mechanical stability in view of temperature, time and constraints. This leads us to assume that they can be stored to standard thermodynamic conditions without fear of cross-linking. The viscosimetric study shows that a good storage of the resin (non-self-cross-linkable) leads to a homogeneous mixture of the composite after the addition of the hardener. Subsequently, these two resins have been an objective of two cross-linking reactive systems in the presence of an aromatic diamine (MDA) Epoxy / Amine (DGEBA / MDA) and epoxy novolac / MDA). Subsequently, we compared their thermal stability. Thermo-gravimetric study shows firstly, that standard resins are thermodynamically stable, and then epoxy novolac systems / MDA and DGEBA / MDA. Furthermore, the thermal behavior of novolac / MDA system is better than the DGEBA / MDA system.