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Web forum has become a major information sharing platform for the individual investor where may include much valuable information. In this paper, we apply automatic sentiment extraction methods to assess the public opinions on Chinese stock forms. A case study is conducted with Chinese stock Web forum. The case study shows that web forum can provide valuable information about the stock market and the discussion sentiment characteristic is significant correlated with stock market activities. Result of regression analysis shows the differences in investor sentiment has more power than sentiment index and message volume in prediction to stock index in China.