The present invention provides a method of improving channel quality feedback. According to an embodiment of the present invention, it is proposed a method, in a user equipment, of improving channel quality feedback in a non-codebook based 3D MIMO system, the method comprising: transmitting a channel quality indicator of a transmission mode TM2 and a differential indicator to an eNB, the differential indicator indicating a relative gain of another transmission mode relative to the transmission mode TM2. Through the present invention, an accurate CQI feedback is realized for a 3D MIMO TDD system. Meanwhile, the link adaptation for the TDD system according to the present invention does not rely on the open-loop link adaptation mechanism.