A new method and thinking is put forward according to traffic signs. The saliency maps are respectively calculated in L, a, b color channel and H, S, V color channel of two kinds of color space Lab and HSV. And through the number of pixels of the saliency maps obtained in high, median, low brightness range to screen which saliency map in Lab and HSV color channels is effective. Finally, the final saliency map is obtained through the fusion. The experiments show that the method is easy to be implemented and can detect salient region of traffic signs fast and effectively.