The present disclosure provides QoS management methods, QoS management devices and a QoS management system. According to the present disclosure, with respect to a terminal in a dual-connectivity scenario, QoS parameter thresholds corresponding to a QoS parameter may be re-allocated to an MeNB and an SeNB for the terminal in accordance with an initial value corresponding to the QoS parameter of the terminal, so as to ensure that a QoS parameter value finally acquired by the terminal and corresponding to the QoS parameter does not exceed a numerical range defined by the initial value of the QoS parameter. As a result, it is able to match services provided to the terminal with the QoS that should have been possessed thereby in the case that the terminal is served by the MeNB and the SeNB, thereby to control the QoS of the terminal.
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