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We introduce SemDiff, a novel technology for finding semantic differences between two binary files. Now, the vendor will release the information to patch the previous version which has vulnerability. Then, we can compare the differences and similarities between the two versions to get the unpublished details of the 1day vulnerabilities. Tools, such as BinDiff, BinHunt and iBinHunt, have worked on this project before, however, there are some weaknesses on them. Just like BinDiff, a comparison method based on structure, can not be effective for judging the semantic differences. Though the other two tools(BindHunt and iBinHunt) can recognize the differences we focus on, they can not effectively verify the functional inlining and spend a pretty long time to finish the process because the use of graph-based isomorphism algorithm. In the paper, we first propose SemDiff, which uses the existing tool(angr) to generate the intermediate language(VEX). Then, because of the nature of program, the data read from and written to the memories, we record these information to implement the comparison. Last, an improved BinDiff algorithm is used to match the basic blocks. In this paper, we take some real vulnerabilities as examples, such as CVE-2010-3974-Microsoft Windows to test our tool, reaching a good goal, matching more blocks than BinDiff and taking less time than BinHunt and iBinHunt.