From the perspective of theory and experiment, this paper analyzes the feature of optical fiber sensor displacement, expounds a method to test the abradability of a workpiece, by using a kind of optical fiber sensor displacement features, studies experimental principle, practically testing data and theoretical analysis of the sensor displacement features, attains the goal on the abradability test on easilyworn workpieces in industrial production, and proves the accuracy of the experimental data and the feasibility of the scheme.