The aim of this paper is to propose, in a social constructionism systemic perspective, a model of marital therapy, oriented by couple`s interactional patterns in therapy, as markers and predictors of the conjugal ties formation and dissolution. It is proposed a methodological formulation, for the construction of a psychotherapeutic model that contemplates the explicitness of the epistemological, theoretical, morphological and technical aspects, concerning the insertion in the epistemic, doxological and axiological fields, and of social demand. Within this proposal, studies on subjects relevant to the construction of this therapeutic model, such as conjugality patterns in post-modernity; characteristics emerging from the studies on couple psychotherapy, focused on therapeutic efficiency and efficacy; studies on markers and predictors of the conjugality formation and dissolution; the changing process in psychotherapy like the increase of autonomy and complexity as the production of new subjectiveness are reviewed. The presented model emphasizes, besides the systemic focus on the psychotherapeutic relation, the social construction of subjectivity and the meaning of conjugality, in which the therapist is a co- participant, stimulating, though his speech, disturbances that take to 2nd level changes, favoring creative aspects in the conjugality, within the social space of intersubjective construction. Some technical and ethical issues are pointed out. New directions of exploration are proposed.