In order to reduce nursing intensity and improve freedom of the elderly and the disabled,a multi-function nursing wheelchair which can switch chair to bed and realize many kinds of posture transformation is designed.This paper introduces the mechanical structure design (position adjustment mechanism and variable wheelbase mechanism) and control design of posture transformation unit of multifunctional nursing wheelchair. In order to reduce nursing intensity and improve freedom of the elderly and the disabled, a multi-function nursing wheelchair which can switch chair to bed and realize many kinds of posture transformation is is. This paper introduces the mechanical structure design (position adjustment mechanism and variable wheelbase mechanism) and control design of posture transformation unit of multifunctional nursing wheelchair.