Currently, barrier packaging materials are widely used in the food and pharmaceutical industries. Aluminum foil composites and vacuum metallized materials are frequently used in barrier packaging. Vacuum metallized materials, replacing aluminum foil composites, not only reduce production costs but also decrease aluminum consumption, thus gaining widespread acceptance from both manufacturers and users due to their low cost and environmental friendliness. Vacuum metallized materials can be broadly classified into two categories: vacuum metallized paper and vacuum metallized film. Vacuum metallized films mainly include: VMPET polyester metallized film, VMCPP cast polypropylene metallized film, VMBOPP biaxially oriented polypropylene metallized film, VMCPE polyethylene metallized film, and VMPVC polyvinyl chloride metallized film. These materials all use a polymer film as a substrate, with aluminum deposited on its surface. A common characteristic of vacuum metallized materials is poor abrasion resistance of the metallized layer, making them prone to scratches and damage to the dense surface. As barrier materials, vacuum metallized paper and film are typically evaluated for their barrier performance using two indicators: oxygen permeability and water vapor permeability, which can be tested using two different methods. **Water Vapor Transmission Rate Testing:** The water vapor transmission rate of vacuum-metallized films was tested using the cup method and MOCON moisture permeability tester, according to GB/T 1037-1988 standard. Sealing the cup is a crucial step in sample preparation. During this step, the part of the sample in contact with the metal sealing ring inevitably experiences friction and scratches. Simultaneously, the high-temperature liquid wax also affects the barrier layer, thus influencing the water vapor transmission rate. Furthermore, the direction of water vapor transmission must be considered during the experiment. Because the vacuum-metallized layer is always exposed on one side of the film, when water vapor permeates from the metallized layer to the substrate layer, the exposed metallized layer, formed by adsorption, will develop pinholes, increasing the water vapor transmission rate and affecting the material's usability. The water vapor transmission rate experiment was conducted using the American MOCON moisture permeability tester, according to ASTM F 1249-2001 standard. The sample was clamped and fixed by the upper and lower cavities, ensuring minimal friction on the sample. The lower chamber of the experimental chamber is filled with distilled water or salt solution, creating various humidity environments. Therefore, the direction of water vapor transmission must be considered in this method. Based on the experiments, the following conclusions can be drawn: When testing the water vapor transmission rate of vacuum-coated aluminized composite films with exposed aluminized layers, the aluminized layer should face as close as possible to the low-humidity environment, especially in environments with 100% relative humidity, to minimize the impact of water vapor on the density of the aluminized layer. Regarding the experimental method, following the ASTM F 1249-2001 standard, using a MOCON moisture permeability meter can effectively avoid the influence of experimental operations on the experimental data and obtain test results in the original state of the sample. Oxygen Transmission Rate Testing: Differential Pressure Method and Coulomb Isobaric Method According to GB/T 1038-2000 standard, the oxygen transmission rate of vacuum-metallized films or papers is tested using the differential pressure method. The experimental steps are as follows: sealing and fixing the sample → evacuating the experimental chamber → filling the upper chamber with oxygen → continuing to evacuate the lower chamber → stopping the evacuation and starting the test. Vacuum-metallized materials have poor wear resistance. In this method, the upper and lower chambers of the experimental chamber are locked by pressure applied by clamps when fixing the sample, which generates significant friction at the sealing ring, thus reducing the material's wear resistance. Furthermore, the aluminum coating of vacuum-metallized films is usually electrostatically adsorbed onto the substrate. During the experiment, when the aluminum coating faces the lower chamber, the evacuation step will affect the aluminum coating, reducing its oxygen barrier properties. Vacuum-metallized paper is hard and brittle, with greater rigidity than the film material. The differential pressure method suffers from poor sealing and is prone to damaging the aluminum coating during sealing and fixing. Therefore, it is recommended to use the coulomb Isobaric method to determine the oxygen transmission rate of vacuum-metallized materials. The method was based on ASTM D 3985-2002 standard and used the American MOCON oxygen permeability tester. On one hand, the MOCON oxygen permeability tester has superior sealing measures in the sample sealing and fixing process, and the fixing device avoids repeated friction. On the other hand, this method does not involve a vacuuming step, so there is no need to worry about the quality of the aluminum plating layer being affected; oxygen permeability can be examined from both sides of the material.