With an attempt to develop permeable packaging film for fresh produce, a series of linear low density polyethylene (LLDPE) / cassava starch blend films with starch content ranging from 10 to 40% were prepared by extrusion. Their moisture sorption characteristic, mechanical properties, barrier properties (gas transmission rate, water vapour transmission rate) and surface morphology were studied. The results indicated that at studied relative humidity (99%RH) initial moisture absorption rate and moisture capacity of the blend films were affected by starch content and temperature. Tensile strength slightly decreased with the increase in starch content in the LLDPE films. Before conditioning at 99%RH, 25°C for 72 h there was no significant difference in mechanical properties among the blend films, unlike after conditioning. The blend films showed high oxygen and carbon dioxide transmission rates (O2TR and CO2TR) and moderate water vapour transmission rate (WVTR). SEM micrographs verified micro-void structure possibly influencing barrier properties of the films.