The present invention is to provide a control system including a sensing device capable of periodically driving a corresponding operation device based on a trigger policy, wherein the sensing device and the operation device have the same trigger policy stored therein. The control system is characterized in that the trigger policy at least includes a trigger code, a time data (such as “after 15 minutes”) and an operation data (such as “turn on a lamp”). When the sensing device detects a sensing signal, the sensing device generates and transmits a trigger instruction to the operation device. When the operation device determines that a trigger code carried in the trigger instruction matches with a second identification code stored therein, the operation device calculates an expiration time of the time data based on the current time, and then executes an action corresponding to the operation data at the expiration time.