Heathcliff in Wuthering Heights was a character of duality of humanity and brutality.

Nowadays,by focusing their attention on the exposure of privacies and on the display of human beings brutality,desire and absurdity of existence,a group of writers are been on scanning and observing ugliness.

In literature works,human nature is focused while the beast nature is ignored.

By ingenious designing of contradictions in the plot, character and dialogue, King Lear deeply reveals the conflict and confrontation between divinity and barbarity.

This article holds that human nature is the combination of barbarity and humanity.

"Beast"is a derogatory term in Western Culture, but Djuna Barnes, a minor but great American novelist, advocates that"beast"is an attractive word.

The beast image and black image in Luo Fu s poems have great impact upon the rational and moral social order;at the same time are testifying the decay of human being s vitality in the civilized society;and present author s recognition of life s naturalness and sustainability advocated by surrealists.