Abstract: Based on the data of tobacco planting in Yihuang County of Jiangxi province，a fuzzy membership function was used to construct a risk assessment model to evaluate meteorological hazards in seedbed stage.Results showed that：before sowing，determining sowing date by calculating average temperature of next ten days according weather forecast in order to ensure smooth sowing of tobacco；sowing time，via measuring temperature of greenhouse and temperature range which was suitable for tobacco，adopting measures of temperature increase，heat preservation or cooling in order to ensure sprouting of tobacco seedlings；during seedling stage，measures of temperature increase，heat preservation or cooling was adopted to promote normal growth of tobacco seedlings by monitoring temperature difference inside and outside greenhouse.