recently, personnel accidents caused by elevators occur in a high frequency. This situation raises people's concern to the safety of elevators. Elevators are complicated electromechanical equipments in order to ensure the high degree of security by all aspects, which include the materials, technology, design, manufacture, installation, alteration, inspection, test, maintenance, management, and uses. Those all have a series of strictly national technology standards and regulations. The keys whic h a elevator operates safely are depending on repair and maintenance. Moreover, the quality of technicians determines how an elevator operates in well-functional. Whethe r the operation is safe or not is controlled in technicians' hands.
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