It is a staircase-type access system for disabled comprising, • Lower platform , • Upper rail , • Lower rail as basic elements and • An upper step-piece , • An intermediate step-piece , • A step-piece fixed to the lower platform , • A connection element of the step-pieces connected on one end to the lower platform , and on the other end to an upper rail vertical support element , • A connection element for a step motion transmission feature , connected on one end to the upper rail vertical element , and on the other end to the intermediate vertical support element , • Step motion transmission features connected on one end to the connection element of the step motion transmission feature , and on the other end to the upper step-piece , the intermediate step-piece and the step-piece fixed to the lower platform , • A hinge connection located between the lower platform and the connection element of the step-pieces , enabling the angle between the lower platform and the connection element of the step-pieces to change, and the upper step-piece , the intermediate step-piece , the step-piece fixed to the lower platform and the lower platform to move parallel to the ground during the vertical elevation and descent of the disabled access system, • A motion and power transmission arm connected on one end to the lower ground , and on the other end to the motion and power transmission arm fixed to the intermediate vertical support element , • A motion and power transmission arm connected on one end to the intermediate vertical support element , and on other end to the motion and power transmission arm fixed to the lower ground , and • A motion and power center . • Lower platform , • Upper rail , • Lower rail as basic elements and • An upper step-piece , • An intermediate step-piece , • A step-piece fixed to the lower platform , • A connection element of the step-pieces connected on one end to the lower platform , and on the other end to an upper rail vertical support element , • A connection element for a step motion transmission feature , connected on one end to the upper rail vertical element , and on the other end to the intermediate vertical support element , • Step motion transmission features connected on one end to the connection element of the step motion transmission feature , and on the other end to the upper step-piece , the intermediate step-piece and the step-piece fixed to the lower platform , • A hinge connection located between the lower platform and the connection element of the step-pieces , enabling the angle between the lower platform and the connection element of the step-pieces to change, and the upper step-piece , the intermediate step-piece , the step-piece fixed to the lower platform and the lower platform to move parallel to the ground during the vertical elevation and descent of the disabled access system, • A motion and power transmission arm connected on one end to the lower ground , and on the other end to the motion and power transmission arm fixed to the intermediate vertical support element , • A motion and power transmission arm connected on one end to the intermediate vertical support element , and on other end to the motion and power transmission arm fixed to the lower ground , and • A motion and power center . <EOS>