As a common physical sign in the elderly, orthostatic hypotension is an independent risk factor of cardi cerebro vascular diseases and falls, and also increases all-cause mortality. Nowadays, continuous noninvasive blood pressure measurement systems are increasingly used in the study of orthostatic hypotension, and usually combined with head-up tilting. Furthermore, orthostatic hypotension is classified by hemodynamic parameters. This review focused on two acknowledged classification systems, morphological classification and physiological classification.