This paper explores the design and empathic effects of data-based videos, focusing on the integration of narrative visualization and emotional engagement. By analyzing the historical evolution and characteristics of data-based video design, the study highlights its unique combination of scientific rigor and emotional resonance through dynamic visual elements (e.g., animations, interactive charts). Key methodologies include data selection with emotional mapping, multimodal integration (audiovisual synchronization), and user testing for empathy evaluation. The research identifies challenges such as balancing artistic expression with data accuracy and addressing emotional shallowness in visualization. Case studies across news, live sports, and documentaries demonstrate practical applications, emphasizing real-time data updates, personalized customization, and ethical compliance. The findings underscore the potential of data-based videos to enhance information communication while calling for interdisciplinary collaboration to optimize empathic impact.