Metal Magnetic Memory (MMM) technology to detecting the mining round-link chains was applied in this paper. And the distribution law of the residual magnetic intensity of round-link chains under different wearing states was obtained by making MMM test to four kinds of round-link chains, which experienced different service time in certain coal washery. The test results indicate that the more sadly the round-link chains were worn, the more greatly the residual magnetic intensity fluctuates and the more increasing the standard deviation of the residual magnetic intensity. According to the residual magnetic intensity and the standard deviation, the deformation of the round-link chains can be determined. And qualitative evaluation was processed to the deformation of round-link chains based on the study conclusion of paper [1], and the results were consistent with the actual situation, which suggested a new method for damage evaluating of the round-link chains.
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