The image of the green hills appears for many times in Yuan Dynasty and has different meanings and functions in specific work, in addition to being an objective scene. It has a lot of internal and subjective meanings. It is not only the soul dwelling and spiritual home of writers but also their partner and friend in the hermit; it reflects the historical nihility and the changing world in the lyric; it is the barrier of the woman and shuts off their sight of the lover's sight in the acacia; and it provides superposition and contrast of color in the scenery.