Water is the most important factor for survival of cacti, because it is highly necessary for various metabolic activities. Cacti grown in arid environment have developed intrinsic water management systems, such as water collection, water absorption, and water preservation. Water collection method of cacti was well known, but its water absorption and preservation methods are not elucidated yet. In this study, morphological features and wettability of cactus stem were analyzed and an artificial system mimicking these characteristics was designed to perform in vitro experiment. The present results are useful not only in understanding water absorption and storage strategies of cactus but also in providing a design of biomimetic water management device.