A method, system, and device for transmitting a preamble signal and for signal measurement, for use in solving the problem found in the prior art that the transmission power of each antenna unit is greatly reduced as a result that each antenna unit transmits one preamble signal and that the complexity of a user equipment is increased when the antenna units are of a great number. The method of embodiments of the present disclosure comprises: a network side device transmits to the user equipment determined CSI feedback configurations, where one CSI feedback configuration corresponds to one CSI-RS resource, and the preamble signal corresponding to each port of the one CSI-RS resource is transmitted via one set of antenna unit corresponding to the port. Employment of the solution of the embodiments of the present disclosure increases the transmission power of the antenna units, allows the user equipment to correctly perform signal measurement, increases the performance of data transmission, and reduces the complexity of the user equipment when the antenna units are of a great number.