Disclosed in the present invention are a method and device for calculating statistics of inter-system reselection frequency, for realizing calculation and analysis of inter-system reselection frequency of dual-mode user equipment during the 3G network construction in the situation where the 2G and 3G networks are deployed as different location areas at the initial stage of network construction. In the present invention, in the situation where the 2G and 3G networks are deployed as different location areas at the initial stage of network construction, the data is collected based on the radio network control system, the location area or routing area update log of the UE is counted and analyzed, multi-dimensional classification is carried out by the signaling monitoring and analysis system at the network side, the distribution of inter-system reselection frequency of dual-mode user equipment during the 3G network construction is reflected in the sense of statistics, so as to direct the network area coverage layout and network convergence establishment planning and improve user experience.