University students face increasing academic and psychosocial demands that place them at risk of reduced psychological well-being. Positive psychology interventions have demonstrated efficacy in promoting mental health; however, few are grounded explicitly in Seligman's PERMA model and adherence to digital interventions remains limited. This randomized controlled trial aims to evaluate the efficacy of a brief PERMA-based psychological intervention delivered via a smartphone application, with and without supplementary telephone multiconference support, compared to a waiting list control group. The intervention consists of five weekly modules targeting Positive Emotion, Engagement, Relationships, Meaning, and Accomplishment. Assessments will be conducted at baseline, post-intervention, and at six-month follow-up.