A wireless control system for a computer with a processing system includes a power supply, a microprocessor, a wireless control portion and a signal transceiver. The power supply converts an external power into a power for the computer. The microprocessor connects the power supply to control the power supply. The wireless control portion includes a plurality of operation keys to generate different signals and a power source to supply the wireless control portion. The signal transceiver connects to the microprocessor and the processing system. The signal transceiver receives and decodes the signals from the wireless operation portion, and transmits the decoded signals to the microprocessor and the processing system. The wireless control portion triggers the microprocessor to determine whether the power supply provides the power for the processing system.