The semiconductor industry has play an important role in the trend of various high-tech industries. Therefore, this study selected semiconductor stocks as an example, and take technical analysis as the basis to predict and analyze their stocks and trends. Buffett invests in stocks with a unique and peculiar vision. He believes in the so-called "value investment rule". The selected stocks will become effective for investment. Buffett is regarded as many investors as "stock god." On the other hands, the research focuses on gray correlation as data pre-processing. The grey correlation analysis value can be obtained and the importance of financial attributes is analyzed based on Entropy based classification. In this study, Buffett's investment rules are compared. The results of stock portfolio and Buffett's stock portfolio are also compared to find the overall assessment of the return rate and the correctness of stock extraction.