Abstract: The present invention discloses improvements in a service registry in the SOA and relevant improvements in service propagation, query, and service selection and routing methods during service invocation. Said service registry is connected with a local service domain and a remote service registry and comprises: a local service information manager for registering local services in the local service domain, a local service information repository connected with the local service information manager, for storing service metadata of the local services; wherein said service registry further comprises: a remote service information manager connected with the local service information manager and the remote service registry, for receiving a remote service index from the remote service registry; and a remote service information repository connected to said remote service information manager, for storing the remote service index received from the remote service registry.