Water activity (a_w) of osmotic dehydrated purple sweet potato that infused with CaCl2 shown in Figure 2. a_w was decreased in the samples during storage at both temperature. a_w shown no significant after different temperature storage in potatoes. Purple sweet potatoes that were undergone for osmotic process lowest a_w (0.9500) and highest (0.9343) was found in the potato samples storage at room temperature (10 day). The samples stored at room temperature was losing a_w more quickly when compared 4˚C. Osmotic Dehydrated purple sweet potatoes could able withstand for 25 days under low-temperature storage. Whereas, room temperature storage was not successful on extending the shelf life (10 days) of potatoes due to microbial growth.