Trying to understand the development of the racial theory and the reasons for its popularity in the end of the nineteenth century's Germany, the French nobleman Joseph Arthur Comte de Gobineau's Essay on the Inequality of Human Races is a basic document in the historical research. Gobineau was not an original thinker about the inequality of human races, but a synthesizer who constructed a fully furnished intellectual edifice where race explained everything in the human history and civilizations. It was Richard Wagner, the German composer, who supported the translation of Gobineau's work and introduced his racial theory to Germany. Until the Nazi regime, Gobineau's work was still a classical and laudatory book in the field of the racial theory. How did Gobineau use the term of race to explain the development of human history? What kind of the special social miliéu in the nineteenth century's Germany, which made the racial thinking easily to popularize? And what's the direction of the afterwards racial theories indicated from Gobineau? The aim of this research is to answer these questions.