Abstract: The design and method of staircase between the roof of the original building and the second floor of the new added building are presented, that is: put up pos-t built suspended beams perpendicular to the ou-t jacketing frame beams, and then build hanger rods from them, which makes hanger rods vertical load-carrying elements and support the staircase. The staircase linking the original building and the new added floor in Suifenhe Qingyun Market is constructed in this way.