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Web database crawling is a promising solution for Deep Web data integration. To the best of our knowledge, the existing approaches only focused on how to crawl all records in a web database. Due to the high dynamic of most web databases, it is not practical to harvest a small proportion of new records by crawling the whole database. This paper studies the problem of incremental web database crawling, which targets at crawling the new records from a web database efficiently. In the proposed approach, a new graph model, query related graph, is proposed to transform a incremental crawling task into a graph traversal process. Based on this graph model, appropriate queries are generated for crawling which are guided by the samples of the web database. Extensive experimental evaluations over real Web databases validate the effectiveness of our techniques and provide insights for future efforts in this direction.