Drying of Pandanus leaves took place mainly under falling-rate period. During this period, the migration of moisture occurred through the mechanism of diffusion. The peak drying rate for Pandanus leaves was found to be 2.035 g/100 g.min at a moisture content of 367% db at 35 °C drying air temperature as compared to 1.969 g/100 g.min at 45 °C of hot air drying. Drying in a heat pump dryer at 35 °C reduced the moisture content to 150% db within the first 3 h and was comparable to hot air drying at 45 °C for Pandanus leaves. This may be due to low RH of drying air in a heat pump dryer though the drying air temperature was less. The heat pump dryer used by Adapa et al. (2002) was found to have a more specific moisture extraction rate. Initially, the drying rate was more at low temperature but at the later part of drying, it was more in hot air drying at 45 °C (Fig. 2). This indicates that the effect of low RH is prominent during the initial period of drying when the product is moist. The effect of temperature was observed to be prominent in the later part of drying, which acted as a driving force for moisture diffusion. Thus the higher drying air temperature produced a higher drying rate and consequently faster reduction in the moisture content and hence the total drying time was reduced.