With the development of cloud computing services, people demand for huge amounts of document resources from the Internet growing. It becomes a research hospot that how to quickly and efficiently merge document elements or context from different sources to a new document. Based on the above requirements, this paper puts forward a kind of document combination scheme based on Mashup. Through constructing the Mashup server, we put the document resources which come from the different domain into the new XML file. And according to users' requirements, the orchestration of the document after the combination with DITA system design into a set of output in the form of different output. Finally, we through a medical electronic health records to verify the document combinationscheme based on Mashup.