DS and D12 H genes,which are involved in ginsenoside biosynthesis were obtained by Reverse Transcription Polymerase Chain Reaction(RT-PCR)and Enzyme Digestion Connection(EDC)techniques.Expression vectors of both genes were constructed,namely DS-pAUR123 and D12H-pAUR123.Then,both expression vectors were transformed into Saccharomyces cerevisiae.Results show that both genes can be heterologously expressed into functional enzymes.