Application of intelligent system technology can help human work, especially in this case to support oyster mushroom (Pleurotus ostreatus) cultivation. In mushroom treatment, it needs to water this mushroom periodically using clean water to keep the humidity and temperature suitable. Oyster mushroom can grow and develop with temperature in range 15 to 30 degree Celcius and relative humidity in range 80 to 90 percent's. Farmer's still water mushrooms manually depending on their feeling. The proposed system utilizes Fuzzy Logic to control temperature and humidity as parameter inputs by spraying waters in some duration as output in fuzzy logic. This system as well can monitor those parameters and send them to server computer periodically and do spraying from smartphone that is connected to this server by Internet of Things technology.