The present invention provides A ceramide compound, comprising: a structure of general formula I or an enantiomer or diastereomer of general formula I:

##STR00001## in which: R.sup.1 is selected from the condensation residues of ferulic acid, sinapic acid, abscisic acid, sotretinoin, tretinoin, fusidic acid, royal jelly acid, sorbic acid, caffeic acid or trans-cinnamic acid; R.sup.2 is selected from one of the following structures:C.sub.15H.sub.29, C.sub.15H.sub.31, C.sub.15H.sub.27, CHOHC.sub.14H.sub.27, CHOHC.sub.14H.sub.29.

The present disclosure also provides a ceramide compound containing conjugated carboxylic acid, preparation method therefor and application thereof. The invention reacts functional carboxylic acid with sphingosine base to obtain a class of ceramide compound with novel structure. The introduction of physiologically active molecular fragments of functional carboxylic acids into ceramides will enhance the original efficacy of this type of molecules and also improve the physical and chemical properties of ceramide compound. For example, improving the antioxidant properties of ceramide compound.

The present invention provides A ceramide compound, comprising: a structure of general formula I or an enantiomer or diastereomer of general formula I:

##STR00001## in which: R.sup.1 is selected from the condensation residues of ferulic acid, sinapic acid, abscisic acid, sotretinoin, tretinoin, fusidic acid, royal jelly acid, sorbic acid, caffeic acid or trans-cinnamic acid; R.sup.2 is selected from one of the following structures:C.sub.15H.sub.29, C.sub.15H.sub.31, C.sub.15H.sub.27, CHOHC.sub.14H.sub.27, CHOHC.sub.14H.sub.29.

The present disclosure also provides a ceramide compound containing conjugated carboxylic acid, preparation method therefor and application thereof. The invention reacts functional carboxylic acid with sphingosine base to obtain a class of ceramide compound with novel structure. The introduction of physiologically active molecular fragments of functional carboxylic acids into ceramides will enhance the original efficacy of this type of molecules and also improve the physical and chemical properties of ceramide compound. For example, improving the antioxidant properties of ceramide compound.