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10ms。Mathematical model of greenhouses heating system by using geothermal water resources was developed and numerical analysis was determined based on the theory of heat transfer and control. The experimental method to determine the parameters of the greenhouses heating system mathematical model was introduced. In the greenhouses heating controller, which was designed and implemented with internal model control technology, the Smith predictor configuration was represented and combined with a PI controller. The approach to tune the parameters of the heating controller was defined. Results showed that the geothermal water resources is suitable for greenhouses heating and the heating controller performances, such as control accuracy and response time, matched current heating need of the greenhouses. 