Passenger elevator, freight elevator, car elevator, etc. all kinds of elevator and other mechanical and electrical equipment, if they are used properly, the person responsible for management and regular maintenance fails to timely repair and complete the troubleshooting out, not only to reduce down time waiting for repair, can also extend the service life of elevator for a long and improve the using effect, promote the installation development. Instead, if used improperly, the life of elevator can be reduced and there might be emergency and equipment accident, can be seen which might result in serious consequences.