Functioning the self-regulatory, the smiling face lead interpersonal systems for the centripetal tendency, when the system is in the centrifugal tendency accorging to the conflict discourse situations and so on. The purpose of this study was to investigate this thing in more detail by the examination of the linguistic strategy level. Subjects were thirteen couples, members of the social dancing club in university. They were asked to participate in conversations with their partners in two conflict situations (role-play and real problem). Each utterance was classified into three linguistic strategies (the avoidance strategy, the pretense strategy, the integration strategy). It assumed that the centrifugal tendency about the system was high in above-mentioned order about this 3 strategies. As a result, the smiling face lead many to the extent that the centrifugal tendency of the strategy in high. In this study, it confirmed that the smiling face had a self-regulatory function of inter-personal system in the linguistic strategy level. Finally, we suggest that by paying attention to the smiling face in the psychotherapy scene, it considered to be able estimating centrifugal phenomenon's of the system.