Zhouyi fully showed the harmonious thinking of Chinese philosophy and culture. The harmious thinkingof Yin and Yang was the quintessence of creating the I - Ching and I - Zhuan system. The thinking wasclosely linked to Chinese society and history, it was the inevitable result that Chinese ancient concepts of Five- elements, Yin and Yang, Harmony between human and heaven, had developed. The harmonious thinkingof Yin and Yang in Zhouyi was condensed into the mode of thinking of upholding neutrality and seeking har-mony, it had made a widespread and profound influnce on Chinese philosophy and culture. Both positive in-fluences and negative influences are well worth reflecting seriously.