The work aims to study the effects of inorganic fillers of nano-scale TiO2, nano- and micro-scale ZSM-5 zeolites for low density polyethylene (LDPE) on the properties of LDPE films. Different inorganic fillers were added into LDPE by twin-screw extruder to make master batch, and then modified casting LDPE film was made by single screw extruder. And then the comprehensive mechanical properties of these films were investigated. The thickness of these films was 91～174 μm. The experimental results showed that the addition of inorganic filler decreased tensile strength and elongation at break of LDPE films to different degrees, but, the oxygen permeability was increased by 17.3%～60.5%, carbon dioxide permeability coefficient of LDPE film was 1.3～3 times of the blank film. ZSM-5 zeolite improved the film water vapor transmission coefficient whereas titanium dioxide decreased its water vapor transmission coefficient. In conclusion, due to the presence of inorganic filler, the gas permeability of modified LDPE films is increased. More efforts are needed to improve the gas and water vapor permeability and mechanical property of LDPE packaging films.