Ethyl cellulose (EC) and modified silica(m-SiO2) were proposed for preparing composite film by the blending casting method. The microstructure of the composite film was characterized by SEM and FT-IR. The physical and chemical properties of films were investigated. The results showed that the nanoparticles were uniformly distributed in the film to form a uniform porous structure when the volume ratio of the m-SiO2 alcohol sol to the EC alcohol solution was 3:2. The film material showed good surface hydrophobicity and the water static contact angle (WCA) of it could reach 145°. The tensile strength(TS) and elongation at break(EB) of the film were 10.452 MPa and 5.40 %, respectively. The water vapor transmission coefficient (WVP）of the film was 0.549 gmm/m2hkPa. For the film(EC-Si3) , the release rate of the curcumin in n-hexane simulation solution was higher than that in the distilled water. Based on the above characteristics, the film was expected to be used as a packaging material for lipid foods.