It is applicable to the water penetration test of rubber boots (shoes) for various purposes. The inflation test method is to seal the sample boot mouth with a clamp, fill the sealed shoe cavity bone with compressed air, when the air pressure in the shoe cavity reaches 10 ± 1.5kpa, put the sample boot into the water tank, make the water surface within 75mm from the shoe mouth, and keep the pressure stable for more than 10s, and observe whether there are bubbles on the shoe surface.