The present application discloses a method for implementing an intelligent service and a communications system and relates to the communications technology field, so that an intelligent service may be performed in a wireless intelligent network (WIN). The method includes: a home mobile switch center (MSC) receives a call routed by a serving MSC, where the call carries a WIN configuration parameter that a home home location register (HLR) delivers to the serving MSC; after determining, according to the WIN configuration parameter of the serving MSC, that the call is a WIN OVERLAY call, the home MSC obtains an intelligent service parameter through a home first network entity; the home MSC implements WIN intelligent service processing according to the intelligent service parameter. The embodiments of the present invention are mainly applied in a WIN.