Andrey Nikolaevich Kolmogorov (1903.4.25-1987.10.20) is one of the greatest mathematicians in the Soviet Union and one of the greatest mathematicians in the 20th century. He has made pioneering contributions in many fields, such as real analysis, functional analysis, probability theory, dynamic system and so on. In particular, I introduced him twice, because Kolmogorov is not only a legendary mathematician, but also has rich and colorful experiences.