A kind of curb and kerbstone wheelchair stair-climbing wheelchair auxiliary downlink system negotiate limit. The system includes wheelchair attachment mechanism A pair of of forearm is adapted to extend to front lifting wheelchair and is retracted to the front of lower wheelchair A pair of of rear arm is adapted to extend to rear portion lifting wheelchair and is retracted to the wheelchair at lower part rear. The system further comprises an arm extension mechanism extension/retractor arm The free end lifting arm of rotatable wheel, on each arm The wheel of the rotating arm of wheel Operation control unit It is used to guarantee with mechanism to keep horizontal in system over the ground in the basic of seat.
