A method and device for performing a statistics on a resident time span ratio of a dual-mode single-standby terminal user in dual networks are disclosed, including: setting a T start , a T end and a period t; with respect to a network of each mode in the dual networks respectively, acquiring a periodic location update times, periodic routing area update times, call time span except periodic location update and periodic routing area update, number of starting-up users, T3212 and T3312 of said user in each period t within a time slice from the T start to the T end ; according to the parameters, calculating resident time spans of each user in dual domains or CS single-domain network in an idle state, in PS single-domain network in the idle state, and in a connection state, and obtaining the respective resident time spans, thereby the resident time span ratio, of each user in the dual networks. With the present invention, the accurate and effective statistics for the resident time span ratio of the dual mode single standby terminal user in the dual networks is implemented.
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