其解体的原因是多面的，但是归根结底主要是内部原因和外部原因的共同作用导致了苏联的解体。
Soviet Union's disintegration is due to is various, but ultimately the main internal causes and external causes jointly lead to the disintegration of the Soviet Union.
领导人因素：戈尔巴乔夫的错误路线、方针和政策是苏联解体的直接原因；
Second, leader's factor: Gorbachev's wrong route, principles and policies are immediate causes why the Soviet Union disintegrates;
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