Abstract: The evaluation of Xuan Zong Sun Queen's historians always more negative than positive, this is unfair. In fact, in addition to the "evil" of "steal the son and won queen", instead of no other accident were, but several important juncture of the Ming Dynasty played an active role. In the middle of Ming Dynasty had shocked the whole of the "TuMu incident" and "DuoMen incident", sun's political experience and an abundant of the Empress Dowager statue, face danger fearlessly, pick two "incident", the Ming Dynasty had a serious political crisis. She made an important contribution to the Ming Dynasty rule and stability of the country.