The author in the present article makes an exhaustive study with the rhyming of folk Nanxi "Huan Men Zi Di Cuo Li Shen" (《宦门子弟错立身》)by applying math statistics, induction and comparison to shows their internal rules and characteristics.

Emperor Tang Wenzong s Attempt to Destroy the Eunuch Power and the Eunuch Politics;

The eunuch s power strengthening and Prime Minister s power weaking in Tang Dynasty;

Changes of the power of the eunuch since An-shi Rebellion in Tang Dynasty;

Due to the support of eunuchs in power,he fortunately got the kingship which he originally was not entitled to.

The ranks of eunuchs in Southern Dynasty were much lower than those in Northern Dynasty,and as a result,the political and social status of eunuchs in Southern Dynasty was far incomparable to that of their counterparts in Northern Dynasty,and the display of eunuchs in military affairs in Southern Dynasty can be considered rare.

The Yellow-Door North Temple of the Eastern Han was a jail set up within the Imperial Palace, chiefly targeted at those among the literati and officialdom who were opposed to the monopoly of power by the eunuchs at court.

Some ancient historians appreciated emperor Zhu Yuan zhang′s (Tai zu) strict domination eunuches.

The Eunuches’ intervention in the judicial proceedings in the middle and late days of the Tang Dynasty was a concrete expression of the monopolization of power on the part of the eunuches.

In the preface of eunuchs’ biographies in the Old Tang History, two of the five bureaus, belong to the Imperial Service Minister, is depicted as follows: Imperial Servant Bureau is in charge of providing the palace with curtains, lamps and candles, while Imperial Office Bureau takes charge of the supply and storage.