Abstract: Based on the Semantic Programming Language(SPI)，a mechanism was proposed for handling exception of semantic process. Firstly,focused on the external services invocation failure and processes internal logic failure during the execution of semantic process, the corresponding exception ontology for semantic process was given. On the basis of exception ontology,five exception handling operations were given to construct ECA rules for exception handling. Then, a prototype implementation based on ECA rules for handling exception of semantic process was given. Finally, a case study demonstrates the effectiveness and feasibility of the mechanism.

Key words: SPI，Exception handling, Semantic Web service, Business process