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In this paper, we design and implement a cross-media information retrieval system based on the area of food safety emergencies. The system collects Internet information using topic crawler, establishes data index on cross-media information and makes fast retrieval by sort labeling. The system supports image semantic retrieval and expansion retrieval based on Ontology. The cross-media retrieval provides a new technology for the research of emergencies field, and meets unique retrieval needs by the largest extend.