Abstract: Some the concepts  are introduced about the reflexive embryo,the irreflexive embryo,the symmetric embryo,the antisymmetric embryo,the equivalence embryo,the partial ordering embryo et.in a binary relation.The properties of these  embryos are discussed.And three the embryo decompositions of binary relation are obtained.

Key words: reflexive embryo, irreflexive embryo, symmetric embryo, antisymmetric embryo, equivalence embryo, partial ordering embryo, embryo decomposition of binary relation