This invention relates to a wireless transmission system, more particularly, to a wireless transmission system, which is used in the foundation. The present invention uses the first wireless network interface, which is assembled in the mobile computer and the second wireless network interface, a microprocessor, and a bridge that is assembled in the foundation to transmit signals. The signals can be transmitted between the mobile computer and the foundation by using the first wireless network interface and the second wireless network interface. The bridge is used to collect the addresses and the signals, which are transmitted from the devices that are connected with the foundation. These addresses and the signals will be transformed to become the wireless signals by using the microprocessor. Then the wireless signals are transmitted to the second wireless network interface and are sent to the first wireless network interface to make the mobile computer control the devices, which are connected with the foundation, by using wireless controlling.