The present dissertation seeks to develop the actual regulatory dispossession landmark made by social interests with agrarian reform goal formed by the Federal Constitution of 1988 and by the laws that regularized it, analyzing its elaboration process, so much as its content and application. The present dispossession regulatory laws of the subject in analysis are the development of a long political struggle in the Brazilian society, struggle that shows no sign of ending in the near horizon. Thus, this conjoint of laws are not only contradictory and ambiguous but are also clearly contrary to the real effectiveness of the agrarian reform. Hitherto, it has been a retrocession to the agrarian reform if compared to the previous Constitution once it has diminished the Executive`s expropriatory capacity. Nevertheless, since 1995, because of the intense pression and the rural workers mobilization in favor of the agrarian reform there has been an increasing number of dispossession and of family settlements made by the federal government .In a nutshell, the intended investigation has as its main theorical reference in the general theory of law the Danish author Alf Ross. It also seeks to contribute to an exact comprehension of the nowadays barriers to the agrarian reform realization in Brazil and to a related legislation improvement.