(It is pointed out that the integration of GSM and TD networks represents the inevitable trend of 2G and 3G hybrid networking, and to end hybrid networking, the key is to manage their interoperability, such as network camping, cell selection, cell reselection, and handover As well as user access control and network transfer. On this basis, the strategy of interoperability is discussed, including the strategy of cell reselection between systems (such as the criterion of cell reselection between TD and GSM and the setting of related parameters);)