The relationships between the parameters of drying characteristics, effective moisture diffusion coefficient, apparent activation energy and the drying kinetics equations of Areca catechu in different temperatures were studied using the Fick’s second law and the mathematical model of betel nuts drying. The results showed that the drying curve of betel nuts at 70 ℃ and 75℃ had a significant difference; and the hot air drying was a process of falling-rate drying of internal moisture diffusion control. The variation range of water diffusion coe...