A method for watching high-definition cable TV programs includes: a blue-tooth learning remote controller learning remote-controller controlling instructions of a high-definition cable TV set top box, and uploading the learned instructions to a smart terminal such that the smart terminal controls the high-definition cable TV set top box; the smart terminal controlling the high-definition cable TV set top box to choose high-definition cable TV programs; the high-definition cable TV set top box outputting a HDMI signal; the smart TV dongle receiving the HDMI signal, and outputting the HDMI signal to a high-definition TV; the smart TV dongle performing an encoding and a packing on the HDMI signal and then transmitting the packed signal to the smart terminal by using a wireless manner; and the smart terminal performing a de-packing and a decoding on the received signal and then playing the decoded signal on the smart terminal.