The test machine is equipped with a pressure plate, and the test plate is equipped with a test nail. The test nail is a head with the tip cut off. The hardness of the nail head should be greater than 60HRC. Place the sole sample on the chassis of the testing machine in a position that allows the test nail to pierce through the outsole. The test nail pierces the sole at a speed of 10 mm / min ± 3 mm / min until it penetrates, and record the required Maximum force. Choose 4 points on each sole for testing (at least one point is in the heel), the distance between each point is not less than 30mm, and the distance from the edge of the insole is greater than 10mm. The bottom with anti-skid blocks should be pierced between the blocks. Two of the four points should be tested within a distance of 10-15 mm from the edge of the planting bottom. If humidity will affect the result, the sole should be immersed in deionized water at 20 ℃ ± 2 ℃ for 16 ± 1h before the test.