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More and more services (e.g. IMS services) in the telecommunication field are built by combining different service features. One service can be appended with new service features to form an integrated service to meet new requirements of subscribers. An Aspect-Oriented Software Development (AOSD)-based method of appending the original old service (called the primary service) with other new service feature is proposed in this paper. The new service feature is added to the primary service as an aspect, which would extend the service functionalities while keeping the logic of the primary service unchanged at the same time. The main idea is to model the logic of the primary service with Petri Net and to add the new service feature with AO (Aspect-oriented) analysis. An example for service integration is presented to demonstrate how the method works. Finally, AspectJ-based implementation of the service is given to validate the feasibility of the method.