Paste the cut sample on the test piece fixture of the portable MARK-II slip resistance testing machine, put down the weight on the rotating support frame on the test piece fixture, so that the test piece is pressed against the floor interface by a fixed force, By tilting the rotating support frame of the portable MARK-II anti-skid testing machine, the horizontal thrust on the test piece is gradually increased until the test piece slips instantaneously. The friction coefficient value of the sole test piece before the instant sliding occurs is the maximum static friction coefficient of the test sole on the floor interface, that is, the anti-skid coefficient.