A synchronous wireless transmission method is used in a synchronous wireless transmission system including a first wireless device for generating a wireless signal, a second wireless device for generating a second wireless signal, and a wireless signal receiver for receiving the first and second wireless signals. The wireless signal receiver receives the first wireless signal in the first receipt time segment and the second wireless signal in the second receipt time segment. When the first or second wireless signal is received, the wireless signal receiver issues a responding signal to the first or second wireless device. According to the responding signal, the first and second wireless device determines whether the time of issuing the first or second wireless signal to the wireless signal receiver is adjusted.