Purpose: combining with calligraphy theory, to improve the visibility of bitmap fonts on the LED variable information board, on the basis of these, to enhance aesthetics and cultural characters of bitmap fonts, so as to display the cultural intension of countries and cities. Methods: through literature review and field investigation, analyzing the problems of identification and aesthetics on the LED variable information board in urban public space, according to the method of Chinese characters' structure in calligraphy theory, combined with some traditional Chinese characters as pace of force field, counter, type face, bring up optimum design of bitmap fonts from the aspects of strokes and structure, in order to improve the recognition of the bitmap fonts and aesthetics. Conclusion: Through spatial structure theory, improved the identification of bitmap fonts; according to the method of Chinese characters' structure to enhance aesthetics and cultural characters of bitmap fonts. Based on calligraphy theory, to summarize the design method of the bitmap fonts about identification and aesthetics.