1. Voluntary reunification of the German people. Since Germany split the two countries, the gap between the development levels of the two sides has gradually widened, and relatively backward East Germany is eager for the reunification of the two countries. 198910 June 18, erich honecker, leader of the East German Unified Social Party, announced his resignation for health reasons, and the Central Committee of the Unified Social Party elected egon krenz to succeed honecker. After krenz took office, he immediately announced the implementation of "thorough reform", announced the pardon of all those who fled and participated in demonstrations, and formally contacted the West German government.
Second, the Soviet Union has its own problems. At this time, after a long period of cold war hegemony with the United States, the domestic economy was overwhelmed, social contradictions continued, people's opposition intensified, and Soviet rule was in jeopardy. Therefore, at this time, the Soviet Union has been busy with domestic affairs.
Third, the tacit support of the western world. The reunification of Germany and Germany will greatly weaken the influence of the Soviet Union in Western Europe, which is a heavy blow to the Soviet Union after the great changes in Eastern European countries. Therefore, western capitalist countries supported the reunification of Germany and Germany, which played a certain role in containing Soviet interference.