Most of our domestic scholars also hold this view., After all, the external factors are conditions and internal factors is based on both external only through internal factors can play a role. Scholars believe that "the collapse of the Soviet Union, the fundamental and the key reasons for the deterioration of the ruling party to decide the fate of The key factor in the leadership in so not a Marxist party, the execution is not Marxist ideological line and political line. caused by the deterioration of the party's ideological line change --- the ideological line of the changes caused by changes in the fundamental system of society --- fundamental social changes in the system lead to the final disintegration of the Soviet Union.