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Sina meteorological microblog was taken as data resource, with a view to Sina Shaanxi meteorological microblog, the paper achieved designing of the system of extraction of public opinion on microblog's hot topic. We introduced in detail the system's whole process, described data extraction, Word segmentation system, hot extraction method, and described the problems occurred in realization and the factors to be improved. The next step will be increased analysis results of images, to get more accurate hot extraction results.
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