The AIGC video about Gannan navel orange, "Qin Tian's Realms", successfully promotes regional agricultural products into a wonderful story with emotional thickness and brand height with imaginative miniature narration and exquisite visual language. Video relies on innovative digital production process: through ChatGPT generation of scripts and keywords, fantasy scenes are Midjourney constructed, and then dynamic editing and packaging are completed through editing, thus realizing efficient and high-level content creation. "Miniature world" is the most prominent creative soul of the work. The plot of mini-people working and caring beside the huge navel orange in the film not only cleverly visualizes the "ingenuity cultivation", but also highlights the fresh and juicy oranges with the help of scale comparison, bringing strong visual temptation. The whole picture is like a fairy tale scene in Hayao Miyazaki's animation, with fantasy healing and great recognition and communication power. The film calmly switches between dream and reality: it not only uses real data such as 25 north latitude and 1800 hours of light to endorse, but also uses elements such as miniature harvest and retro trucks to inject warm story feeling, thus constructing a credible and sensitive "sweet and refreshing environment". The film-level light and shadow composition, smooth dynamics and warm colors further strengthen the brand's high-level texture. From natural endowments to craftsmanship, from health value to taste experience, information advances layer by layer and logic is clear. In the end, the theme of "Qintianjing" is sublimated, and the product is transformed into a sweet and memorable experience. This film not only shows the great potential of AIGC in agricultural brand innovation, but also provides a new way to reshape the brand of traditional agricultural products relying on emotion, art and technology.