The aim of this paper is to better define the geodynamic significance of the tectonic line, (Fammera-Campodivivo fault), located in the Aurunci Mts. (Southern Latium). We have collected about 300 mesostructural data along and nearby the line, then examined with tensor analysis in order to determine the axes of the principal stresses. Work was completed by geological mapping of some key areas along the tectonic line. Meso-Cenozoic thick shallow water carbonates, belonging to the widely known "Latium-Abruzzi carbonate platform", crop out in the examined area, together with Upper-Miocene siliciclastic formations. Sicilide units lay, in tectonic contact on top of both carbonates and siliciclastics formations or, as a subsequent deformative event, are overridden by them. In detail, the structural evolution of the Aurunci Mts., in which the Fammera-Campodivivo fault is arranged, is characterized by two different orientations of the principal maximum stress about E-W and N30 degrees trending connected to the thrusting of the belt. The Fammera-Campodivivo line is interpreted as lateral ramp of the main thrust front, during the lower Messinian. Afterwards an extensional tectonics, late Messinian-lower Pliocene, closes the structural evolution of the Aurunci area. Probably, in this moment, the reactivation of faults trending NW-SE, N-S and E-W, and formation of new planes ENE-WSW trending occurs. Oblique fault on continental breccias NW-SE trending has been observed in post-Pliocene age.