Yichuan sag is a cenozoic sag and located in thesouthern edge of North China Basin.

The Concept of Ecology in Planning of Small Towns——With the Detailed Planning of the New Developed Area in Yinchuan County of Luoyang City as an Example;

On the People-oriented Thought in the Yi chuan Yi zhuan;

The Status of Yichuan I Ching in Chen Yi′s Thought;

Yi chuan ji rang ji and SHAO Yong s prenatal image-number theory;