A wheelchair curb-climbing and curb-descending system for aiding a wheelchair to negotiate a curb. The system includes a wheelchair attachment mechanism a pair of front arms adapted to extend to lift a front portion of wheelchair and to retract back to lower the front portion of the wheelchair a pair of rear arms adapted to extend to lift a rear portion of wheelchair and to retract back to lower the rear portion of the wheelchair. The system further includes an arm extending mechanism for extending/retracting the arms a rotatable lifting-arm wheel at free ends of each arm a wheel motor for rotating the arm wheels an operation control unit and a leveling mechanism for ensuring the seat of the wheelchair remains substantially level to the ground during operation of the system.
