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This study examined how Collaborative Reasoning (CR) impacts adolescents’ development of peer relationships. Participants were 474 seventh-graders from eight classes at a rural middle school in China. Half of the classes (238 students) participated in CR discussions, while the other half (236 students) received direct instruction (DI). Dynamic social network analyses of adolescents’ friendship networks showed that the CR group showed a peer selection effect, indicating that students actively choose peers with similar personal characteristics to form new friendships. However, the DI group exhibited a peer influence effect, meaning that students form peer relationships based on preexisting social structures. These results suggest that collaborative contexts provide students with more freedom to form their own peer relationships.