Introduction to the main courtyard: The main courtyard was built by Du Shi during the Wanli period of the Ming Dynasty. It has a history of more than 400 years and covers an area of 1.04 acres. It is the core courtyard of the former residence. Eight Jinshi and five Jinshi of the Du family came out of this courtyard. Hanlin and a generation of imperial masters are the geomantic treasures of the entire former residence.