Abstract: The model for forecasting the electric field intensity is considered to be increasingly important as a basis for designing telemetry and wireless remote control circuit used in the plantations.In this paper,the three parts of UHF(ultra-high frequency) wireless propagation loss in the plantations,ie the free space propagation loss,the ground propagation loss and the tree propagation loss were proposed based on the theory of electromagnetic propagation mechanisms.The model for forecasting the electric field intensity was developed.Experimental results,performed in oriental arborvitae plantations in Beijing Xishan Mountain Area,show that the model is bias free with high accuracy.