The purpose of this work was to investigate soy protein/xanthan interactions as a function of KCl concentration in heat-induced gels, by evaluating WHC and uniaxial compression measurements. The synergistic/antagonistic effect between proteins and polysaccharides was also studied from the structural characteristics of gels, as assessed by confocal laser microscopy and the electrophoretic pattern of the soluble proteins. Furthermore, the soy protein–KCl and xanthan–KCl binary systems were studied according to their thermal and rheological properties, respectively, in order to clarify the molecular conformation of the biopolymers that participated in the network formation.