[Objective] This paper tries to construct regional public security data governance and process domain ontology in order to improve the level of combination between data governance and process.[Methods] The study based on the theory of linked data, reused public ontology such as DACT, ODRL2.2, then described and governed public security data as data assets, on the other hand we extended EventKG ontology to describe public security process logic, and use PROV ontology to describe the two-way source relationship between data assets and process models, finally based on the concept (SKOS) and organization (ORG) ontology, the relationship between data governance and process is constructed, and the reflection of data governance to the process ontology construction is completed.[Results] The domain ontology is based on 6 public and general ontologies, make it has good scalability and reusability. The relationship richness is 0.773 which close to 1, indicating that the ontology has rich inter-class relations, which help to better describe the complex relations of data governance and process in the public security domain. Based on the ontology, the knowledge graph and applications were built in 1 prefecture-level city.[Limitations] Further expansion to cyber public security data is needed.[Conclusions] The domain ontology and application services provide new perspectives and practical references for data governance and information services in regional public security research and practice.