The cleavage structure in a democracy is crucial to its stability. Since the 1990s, more people on Taiwan have embraced Taiwanese identity, and most elite groups have accepted the principle of ”Taiwan priority.” Despite these unmistakable trends, the issue of national identity has retained its seemingly dominant salience, to the extent of eclipsing all other potential cleavages. This essay employs spatial analysis to investigate the cleavage structure in Taiwan toward the 2004 presidential election. The findings reveal that, as of 2003, Taiwan's political space was dominantly defined by the Green vs. Blue dimension. The essay discusses the implications of these findings for Taiwan's democratic future.