Driven by national policies and the upgrading of digital industries, micro-series are undergoing a paradigmatic shift from sensory stimulation to in-depth narration. Targeting the superficial aesthetic taste and skewed value orientation caused by syntactic impoverishment in micro-series, long-sentence narration stands as the core approach to upgrade audio-visual structural construction. Relevant research demonstrates that the introduction of modifying and reflective audio-visual elements effectively facilitates micro-series to evolve from episodic emotional arousal to lasting emotional sedimentation. In practical creation, long-sentence narration reconstructs the semantic space of micro-series through the development of character arcs, in-depth thick description of social issues, and embedded emotional blankness. Confronted with dual risks including rigid production cost constraints and the audience’s ingrained reliance on instant pleasure, establishing a dual-track narrative framework featuring suspense hooks at the macro level and detailed thick description at the micro level serves as an effective solution to ease industrial contradictions and strike a dynamic balance between commercial logic and artistic pursuit.