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In this paper, the classical BF algorithm and its improved method are analyzed. According to the characteristics of string matching, a new improved algorithm I_BF algorithm for BF algorithm is proposed. The I_BF algorithm determines the right distance according to the first character of the pattern string and the distance between the matching windows, so it fasts matching. The matching way of I_BF algorithm is from left to right. In order to test the performance of the I_BF algorithm, the I_BF algorithm is tested under the same conditions from three aspects: the number of matches, the number of matches and the time spent. The experimental results show the I_BF algorithm is more quickly and more efficient because it reduces greatly the number of matching and character comparison for maximizing to skip the bad characters.