PE membrane was prepared by extrusion blow molding method and heat triggered color changing film was prepared by tape casting method. The two kinds of membranes were composited. The mechanical property and the optical performance of the composite film were studied. The results showed that the mechanical properties and optical performance of the composite film is falling; the composite film retains excellent discoloration performance. All of the indicators proved that the PE/ heat triggered color changing composite film can be used in food packaging.