a_w was purple sweet potatoes that were undergone for osmotic process lowest (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.