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To improve and enrich the airflow organization scheme of greenhouses in high-altitude areas and enhance the environmental control level within the greenhouses, this study combines field experiments and numerical simulations to analyze numerous factors affecting greenhouse ventilation. A natural ventilation model suitable for local single-span plastic greenhouses has been established. Based on this, the threshold wind speed values for classifying natural ventilation types in high-altitude areas are proposed for the first time, and a comprehensive evaluation of the natural ventilation characteristics of the target greenhouse is conducted.