China's marriage law stipulates that both men and women who want to get married voluntarily need to apply to the marriage registration office where the household registration is located.

Therefore, according to the description, it is necessary to go to the marriage registration office of the Civil Affairs Bureau of Taidu District, Xianyang City, Shaanxi Province.

Detailed address of marriage registration:

Relevant laws and regulations: Marriage Registration Ordinance

Article 4

When mainland residents get married, both men and women should go to the marriage registration office where one of them has a permanent residence. If a China citizen marries a foreigner in the Mainland, and a mainland resident marries a Hong Kong resident, a Macao resident, a Taiwan Province resident or an overseas Chinese in the Mainland, both men and women shall * * * go through the marriage registration office where the permanent residence of the mainland resident is located.