A method of extending RF signals in a wireless control system, wherein the wireless control system includes a first electronic device, a second electronic device, and an RF signal extender; the first electronic device has a first RF signal coverage area, and the second electronic device has a second RF signal coverage area; the second electronic device is located out of the first RF signal coverage area; the first RF signal coverage area partially overlaps the second RF signal coverage area, and the RF signal extender is located in an overlapping area between the first RF signal coverage area and the second RF signal coverage area; the RF signal extender has a third RF signal coverage area; the first electronic device and the second electronic device are both located in the third RF signal coverage area; the method of extending RF signals is applied to the RF signal extender, comprising the steps of: A. receiving an RF signal with the RF signal extender; B. analyzing the received RF signal with the RF signal extender to retrieve a piece of data carried in the received RF signal; and C. determining whether the retrieved piece of data follows an RF communication protocol of the wireless control system with the RF signal extender; if so, compiling the retrieved piece of data into another RF signal, and transmitting the another RF signal with the RF signal extender, characterized in that step C further comprises the following steps to compile the retrieved piece of data into the another RF signal: C1. keeping the retrieved piece of data in a data register temporarily with the RF signal extender; and C2. checking if there are more RF signals still being received with the RF signal extender; if no, compiling the retrieved piece of data kept in the data register into the another RF signal with the RF signal extender and transmitting the another RF signal with the RF signal extender; if yes, analyzing every one of the more received RF signals to retrieve a piece of data carried therein with the RF signal extender; and when the retrieved piece of data is considered to follow the RF communication protocol, going back to the step C1. A. receiving an RF signal with the RF signal extender; B. analyzing the received RF signal with the RF signal extender to retrieve a piece of data carried in the received RF signal; and C. determining whether the retrieved piece of data follows an RF communication protocol of the wireless control system with the RF signal extender; if so, compiling the retrieved piece of data into another RF signal, and transmitting the another RF signal with the RF signal extender, C1. keeping the retrieved piece of data in a data register temporarily with the RF signal extender; and C2. checking if there are more RF signals still being received with the RF signal extender; if no, compiling the retrieved piece of data kept in the data register into the another RF signal with the RF signal extender and transmitting the another RF signal with the RF signal extender; if yes, analyzing every one of the more received RF signals to retrieve a piece of data carried therein with the RF signal extender; and when the retrieved piece of data is considered to follow the RF communication protocol, going back to the step C1.