As the scale and quantity of extracurricular scientific activities of senior high school students continue to expand, it is necessary to investigate the scientific attitude of the participating students. The “Scientific Attitude Inventory (SAI II) ”, which was revised by Moore and Foy in 1997, was employed in our research. We investigated 63 high school students with scientific attitudes, who participated in the extracurricular activities of Innovative Talents Training Program of Basic Education in Beijing. This survey finds that the students, who take the initiative to participate in extracurricular activities, are more active in science. The difference between boys and girls is obvious in terms of emotional attitude towards science. In addition, 57.1% of the students surveyed have difficulty in understanding the limits of science. Most of the students lack a sufficient understanding of the value orientation of scientific theory.