The present invention designs a saccharide compound whose structure is shown in formula X, wherein R 1 , R 2 independently selected from substituted amido, substituted triazolyl, substituted amino; R 3 Selected from sulfhydryl, azide, amino, carboxyl; A is or -C m H 2m R 3 , X is selected from oxygen atoms; n is selected from 0, 1, 2, 3, 4, 5, 6, 7; m is selected from 2, 3, 4, 5, 6, 7, 8, 9, 10. The present invention adopts the synthesis strategy of "first side chain derivatization, then glycosylation coupling", realizes the side chain derivatization modification of the TDG molecular skeleton, and realizes the efficient synthesis of compounds. The invention utilizes the recognition and binding of TDG sugar ligand molecules to the target protein, and plays the role of the target head that recognizes and binds to the target protein, and uses it as the target head molecule to construct functional targeting molecules, which has wide application in the fields of tumor detection, tumor immunity and the like prospect.