| In India, the predominant party system of the Indian Congress party from independence has always been thought to help to the compromise and conformity of multi-cleavages. In some extent, the Congress system was the important factor of maintenance of Indian as a united nation. From the1990s, the Congress system collapsed. The plurality and locality of party competition didn’t bring Indian political system on split in the post-Congress era. After a short-time party allies reformation and political turbulence, Indian party system is in the transition of multi-party system dominated by two strong parties. According to analyzing the evolvement of Indian predominant party system, this dissertation studies the influence of social conflict on parties competition and explores the relations between social conflict and the party system.There are five chapters in this article. In chapter one, I looked back the previous researches on this issue. Then in the second,three and four chapter, I research the three phases of the Indian party system. The last chapter analyzes the trend of party system after the end of predominant party system. Indian party system is in the transition of mufti-party system dominated by two strong parties. The Congress and BJP are two polars and numerous local parties are the important forces that can’t be ignored. In the transition of party system, the consensus and conflict in party politics were reflected in political system. |