A channel state indication reference signal, CSI-RS, transmission method, the method comprising: • obtaining, by a network device, a first precoding matrix (step 101); • precoding, by the network device, a CSI-RS according to the first precoding matrix (step 102); • sending, by the network device, a precoded CSI-RS to a user equipment (step 103); • receiving, by the network device, a feedback message from the user equipment for the first precoding matrix; • reobtaining, by the network device, a new precoding matrix when the feedback message indicates that a precoding matrix indicator, PMI, corresponding to the first precoding matrix is not an available PMI of the CSI-RS; precoding, by the network device, a CSI-RS according to the new precoding matrix; and • precoding, by the network device, the CSI-RS continuously according to the first precoding matrix when the feedback message indicates that the PMI corresponding to the first precoding matrix is the available PMI, ∘ wherein that the feedback message indicates that the PMI corresponding to the first precoding matrix is the available PMI of the CSI-RS comprises: a power of the precoded CSI-RS corresponding to the first precoding matrix is greater than or equal to a preset power threshold; and ∘ wherein that the feedback message indicates that the PMI corresponding to the first precoding matrix is not the available PMI of the CSI-RS comprises: the power of the precoded CSI-RS corresponding to the first precoding matrix is less than the preset power threshold. • obtaining, by a network device, a first precoding matrix (step 101); • precoding, by the network device, a CSI-RS according to the first precoding matrix (step 102); • sending, by the network device, a precoded CSI-RS to a user equipment (step 103); • receiving, by the network device, a feedback message from the user equipment for the first precoding matrix; • reobtaining, by the network device, a new precoding matrix when the feedback message indicates that a precoding matrix indicator, PMI, corresponding to the first precoding matrix is not an available PMI of the CSI-RS; precoding, by the network device, a CSI-RS according to the new precoding matrix; and • precoding, by the network device, the CSI-RS continuously according to the first precoding matrix when the feedback message indicates that the PMI corresponding to the first precoding matrix is the available PMI, ∘ wherein that the feedback message indicates that the PMI corresponding to the first precoding matrix is the available PMI of the CSI-RS comprises: a power of the precoded CSI-RS corresponding to the first precoding matrix is greater than or equal to a preset power threshold; and ∘ wherein that the feedback message indicates that the PMI corresponding to the first precoding matrix is not the available PMI of the CSI-RS comprises: the power of the precoded CSI-RS corresponding to the first precoding matrix is less than the preset power threshold. ∘ wherein that the feedback message indicates that the PMI corresponding to the first precoding matrix is the available PMI of the CSI-RS comprises: a power of the precoded CSI-RS corresponding to the first precoding matrix is greater than or equal to a preset power threshold; and ∘ wherein that the feedback message indicates that the PMI corresponding to the first precoding matrix is not the available PMI of the CSI-RS comprises: the power of the precoded CSI-RS corresponding to the first precoding matrix is less than the preset power threshold.