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Plant arabinogalactans consisting of a β-(1→6)-linked D-galactopyranosyl oligosaccharide back-synthesized based on the 1,2-anhydro galactopyranose technique, orthogonal (methoxydimethyl)methyl (MIP) and (2-naphthyl)methyl (NAP) protection strategy, and selective acylation or glycosylation method. The third method is the most simple and effective and it is also used for the synthesis of arabinogalactans composed of a β-(1→6)-linked D-galactopyranosyl oligosaccharide back-bone with α-(→3)-L-arabinofuranosyl branches.