Abstract: To what extent can Existentialism and Marxism be conjoined and synthesized and whether their syntheses are viable? Their theoretical standpoint needs to be sorted out respectively.From the existentialists’ point of view,there are mainly seven basic principles they adhere to:That science and the Absurdity of Reality,ambiguity presides over existence itself,the conscious of subject over everything,explaining and defending the individual freedom,the destiny of humanity,alienation in modern society and questioning the meaning of life and death.Marxism holds the opposite views of objective truth,inevitable uncertainty,human dependence on society,morality upon historical,optimism of historical progress,materialist and historical analysis of alienation and survival practice.Therefore,we can certainly point out that any attempt to synthesize Existentialism and Marxism are invalid,because there are unbreakable theoretical barriers between them.

Key words: Marxism, existentialism