DuE is a fammous tragedy typical in the worldly literature。 The reasons that caused DuE`s fate included social reasons, historical reasons。 These are outside reasons。 Besides there are inside reasons, they are DuE`s dispositious, DuE`s nature is double。 In her nature`s system there are two opposited and united pulses, conscious and noble spirit and staunch fighting will。 The two pulses are made up of specific, lively nature`s elements。These nature`s elements are opposited and united。 That caused her tragedy is her nature。