Question: If it is possible use the third method to identify plants? Content: As we use only rbcl and matk primer for PCR and DNA bar-coding,we always find organism with different species but same DNA coding region. We try to figure out if we can see some differences between these species with other primer; so that we may classify them much more accurate. Preparation: We will find some plants sample in the park and some will be already extracted DNA from lab, we will try to use matK Rbc, psbA-trnH,ITS ,trnL-F as primer with high possibility to amplifying region successfully.