Abstract: The mathematical model of the micrometeorology in a sun-light greenhouse is developed, using the fundamentals of thermodynamics, heat transfer and solar radiation theories. Besides that, the corresponding computer programs are offered to predict the micrometeorological environment inside a sun-light greenhouse, and to simulate and analyse the effects of different parameters such as density of solar radiation, structural and covering materials on the micrometeorological environment. This model is aimed to provide a theoretical basis for the application and expansion of the sun-light greenhouse.