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In this article, as the active localization and measurement system, a novel method for detecting the leveling degree of hardware box with a higher accuracy is proposed. First it realized a 2-dimensional accurate localization system using stepping motors, and then applied precision measurement of the leveling degree of hardware box by the novel laser sensor. S7-200PLC of Siemens, motion module EM253 and stepping motor are tied in wedlock to realize allocation of 2-dimension of X axis and Y axis. The laser sensor realized non-contact and precision measurement. And the result shows the system has more merits like high accuracy, nimble reliable control, non-contact, low defending, strong system transplanting function and improved availability, etc. And the system has applied successfully in foreign-funded enterprise of Singapore.