This article discussed the positive role and negative influence that the empress during Meng and Yuan period administered the country and held court from behind a screen, and the historical source that the empress acted as regent.

Textual Research on the "Huanghou" in Sande Being Huangdi;

Introduces the method of using trace-back algorithm to solve the n-queens problem, analyses the character of the Las Vegas algorithm and the application in n-queens problem, and re- alizes the algorithm strategy of the combination of the trace-back and Las Vegas algorithm to solve the n-queens problem, also gives the efficiency analysis.