The invention discloses a three-dimensional wave beam forming method in long term evolution (LET). The three-dimensional wave beam forming method comprises the following steps that: a base station adopts an array antenna structure, and each antenna in the vertical direction has a port for wave beam forming; a terminal receives a signal, performs channel estimation to acquire a three-dimensional (3D) channel matrix H and selects a horizontal-dimension precoding matrix and a vertical-dimension precoding matrix according to the H; the terminal feeds sequence numbers corresponding to the precoding matrixes selected in the step 2 back to the base station, and the base station recovers the corresponding horizontal-dimension precoding matrix and the corresponding vertical-dimension precoding matrix according to the fed sequence numbers, and generates a 3D precoding matrix; and the base station precodes the sent signal according to the precoding matrix obtained in the step 3, performs 3D wave beam forming on the sent signal and sends the processed signal through the antenna, and the terminal receives the signal and returns to the step 2. By the method, channel information in the horizontal direction and the vertical direction are used comprehensively, and horizontal-dimension wave beam forming and vertical-dimension wave beam forming are realized at the same time, so higher wave beam forming gain can be obtained and the whole performance of the system can be improved.