Embodiments of the present application are related to a method and apparatus for determining active bandwidth part (BWP). According an embodiment of the present application, an exemplary method includes: receiving first configuration information indicating association between BWP and reference signal (RS); determining a first RS, which is indicated by second configuration information, or user equipment (UE) selected, or predefined in specification(s); and determining an active BWP based on the first RS and the association between BWP and RS.