See from the necessity structure of People’s life expansion,desire and need have the same source,but are also different from each other essentially.Need is generated from the necessity structure of People’s life expansion,and its being satisfied is an affirmation and respect to People’s life subjectivity.Desire is the alienated form of need,it is generated from the wrong understanding and unreasonable depressing to People’s need,and the endless expanding of desire is a negating and derogating to People’s life subjectivity.This critical dis...