Abstract: In order to realize the unsupervised visualization data query, a query rewriting algorithm of integrated graph based on non-reasoning mechanism is proposed. The extensibility of graph could extend the traditional data integration framework with view definition. In addition, all necessary metadata, including global schema, source description, mapping and query, were encoded into a single data structure, which simplified the interoperability between them, so that the rewriting algorithm could query such metadata structure, and can effectively identify relevant sources. The experimental results show that the proposed method has good query performance and will not lead to large computational cost.