Abstract: Determination of greenhouse evapotranspiration（ET_c） is important in making the accurate irrigation schedule, improving the agricultural water using efficiency, and increasing the yield and quality of the greenhouse vegetables. The advantage, disadvantages and applicability of the direct and indirect ET_c models, different reference evapotranspiration（ET₀） models for greenhouse crops were analyzed, and the accuracy of the direct mechanism ET_c models was compared, the models for determination the key parameters（canopy resistance parameters） and its influence factors were summarized and analyzed. The previous studies have mainly corrected the canopy resistance parameters and verified the accuracy of the model for specific climatic regions, greenhouse ventilation types, crop types and planting seasons. The universality of the greenhouse crop ET_c model is not sufficient, and the determined model parameters are often not applicable to other types of greenhouse or crop planting seasons. However, the applicability of these ET_c models and parameters in different type of ventilated greenhouses and crop needs to be validated. Hence, it is recommended to focus on the following research on the response characteristics of the greenhouse ET_c to the climatic variations, the comprehensive analysis of the applicability of the different mechanism ET_c models to the climatic and crop types, and the construction of the much applicability and high accuracy ET_c models.