Although SVM maps the input vector into a very high-dimensional feature space, We showed in this paper that it could be it will be benefited from feature selection. The feature selection strategies, which we proposed, are not only decreasing the calculating time, but also give improvement to the classification performance in most cases. In additional., We hope that the gene selection method may be more useful to biological research than in addition to tumor discrimination. Important genes will be an indication to the biological test. We should do more research in gene selection also as well as feature selection in pattern recognition