The invention discloses a method, device and system for achieving user pairing of user scheduling. The method comprises the steps that a first user of a time-frequency resource is determined according to a preset resource allocation criterion; a preset pairing table is sought according to downlink channel state quantitative codes of the first user, pairing downlink channel state quantitative codes which are paired with the downlink channel state quantitative code of the first channel are acquired, the preset pairing table contains the pairing relation of the downlink channel state quantitive codes, and the pairing relation is obtained by preset calculating; a pairing user of the first user is determined from users to be paired, and the downlink channel state quantitive codes of the pairing user are the same as the pairing downlink channel state quantitative codes. The method, device and system for achieving user pairing of user scheduling are used, the complexity of real-time calculation of scheduling and pairing of the user can be lowered, and the system performance can be improved.