For centuries,the far-off Orient remained unveiled as a mysterious land of exteriority both culturally and geographically. However,before the industrial revolution Western studies about the Orient has been a putative object in response to the Western social as it mainly gauged Eastern culture according to its own indigenous cultural tradition. What are the reasons behind this putative attempt to interpret the ancient codes of Eastern civilization through imagination and forged theories? This essay scrutinizes from four aspects-the definition of Orientalism proposed by Said,the illusionary foundation of Oriental study,the egocentric judgment on Oriental culture and the self-referential circulation of Oriental knowledge system while discussing the angels from which Oriental studies view ancient China. Factors including economic and social needs as well as the cultural conceitedness are all involved as we decipher the mysteries behind this special cultural phenomenon.