The effect of CO2 and O-2 on respiration rate of pomegranate arils was determined and suitability of common packaging materials was evaluated for designing MAP. Respiration rate of arils from a local pomegranate cultivar, 'Hicaz', was measured at different O-2 (2, 10, 21%) and CO2 (0, 10 20%) concentrations at 4 degrees C. Oxygen consumption and CO2 production rate of the arils were modeled by enzyme kinetics based models. Inhibitory effect of CO2 on respiration rate was evaluated by four types of inhibition models (competitive, uncompetitive, combination of competitive and uncompetitive, non-competitive types). MAP design was conducted for different package sizes to determine the characteristic of required packaging materials for fresh pomegranate arils. Respiration rate of the arils was significantly affected by O-2 and CO2 concentrations. As O-2 concentration decreased respiration rate decreased. Respiration rate decreased by 10 and 20% CO2 levels. No difference between the effect of 10 and 20% CO2 concentration was detected. The competitive inhibition model for respiration rate can be used in package design for the arils. MAP design analysis indicated that common packaging materials (LDPE, PP) did not provide desired atmospheric conditions for pomegranate arils. Required packaging material's permeabilities were determined for several package sizes from 250 g to 2 kg.