Abstract: In order to grasp the properties of heat transfer and keep various multi-layer covering at different conditions in greenhouse exactly, a model of heat transfer through greenhouse multi-layer covering was developed in this study. A computer program was designed for simulating its heat transfer process, calculating heat transfer capacity and heat transfer coefficient of covering. Heat transfer flux density and heat transfer coefficient of covering could be simulated and forecasted by using this model, based on the thermophysical characteristics of covering, the construct parameters of greenhouse and the environment conditions, etc.. The measurement results indicated that the simulated values of heat transfer flux density through multi-layer were in accordance with the values from experiments. This model is simple and accurate for quantitative analysis of heat transfer through multi-layer covering of greenhouse.