【摘要】 本文通过对玻耳兹曼熵和吉布斯熵的分析和比较，得出结论：在解释宏观系统演化行为和微观起源方面，系综理论仅仅是一种数学工具，玻耳兹曼熵取得了巨大的成功．并根据无规微观行为的稳定性，解释了宏观演化的时间箭头，有力地支持了玻耳兹曼所作的几率解释．更多还原

【Abstract】 In this paper,it is obtained that the ensemble theory is a merely mathematical tool and Boltzmann’s entropy is successfully applied in explaining the microscopic origin of the microscopic behavior.The paper also explains the time arrow of the microscopic evolution according to the stability of the microscopic motion.更多还原