Abstract: A blood pressure cuff assembly for an ambulatory blood pressure monitor may include a hollow cuff and an elastic liner provided on the reverse side of the cuff. An airbag may be provided in the cuff. A first connection part and a second connection part may be provided on the cuff. A third connection part and a fourth connection part may be correspondingly provided on the liner. The effect of tight inside and loose outside is achieved by the combination of the elastic liner and the cuff. When worn on an upper arm, the elastic liner has an elastic deformation and consequently tightens around the upper arm so as to realize certain slip resistance, and the cuff will not slip down even tied a bit loosely when located on the upper arm. The feeling of constraint from the cuff is reduced significantly and the comfort is improved.