A control system including a control device, an irrigation controller and a server is disclosed. The server is linked to the control device and the irrigation controller for receiving a regional information of the irrigation controller. The regional information includes a position information of the irrigation controller, a plant information and a sprinkler information. The server generates a watering schedule according to the regional information and an evapotranspiration information corresponding to the position information. Then, the server transmits the watering schedule to both the irrigation controller and the control device, so that the irrigation controller is set up according to the watering schedule.
