Based on the Outcome-based Education (OBE) concept, this study addresses key challenges in Computer Introduction teaching in private colleges and universities, such as significant student heterogeneity, strong practical preferences, and insufficient learning autonomy, then constructs a "Three-in-One" curriculum reform framework. The framework integrates: (1) a three-tier teaching organization mechanism ("standard instruction-tiered training-personalized tutoring") to unify core knowledge standardization and personalized learning paths; (2) a trinity task system ("professional cognition-vocational skills-research methods") that combines tool application with disciplinary thinking; (3) a three-phase motivation system ("task-driven-team interaction-flipped certification") to activate learning engagement. Teaching practice demonstrates that this framework significantly enhances students' knowledge mastery, tool application skills, and career planning awareness. The study provides a replicable reform approach for introductory computer courses in private universities, offering practical guidance for cultivating application-oriented computing professionals.