A transmission system using the Bluetooth Low Energy is provided. The transmission system includes a broadcast device transmitting broadcast data, and a scanning device receiving the broadcast data and determining whether to execute a response action according to the broadcast data. The response action includes replying with request data to the broadcast device, and the broadcast device determines whether to transmit parameter data to the scanning device according to the request data in order to make the scanning device determine whether to further execute the response action. The parameter data is set according to the request data.