Objective To establish a high stabilizing reaction system for Polygonatum odoratum ISSR-PCR. Methods The Polygonatum odoratum DNA was extraeted with improved CTAB technique and the template DNA concentration, primer concentration, Mg^2+ concentration, dNTP concentration, Taq polymerase dosage and temperature were researched respectively. Result The best reaction system of Polygonatum odoratum was in the 20 μL system containing lxbuffer, 15 ng template DNA, 0.4 μmol/L primer, 2 mmol/L Mg^2+, 1.0 U Taq polymerase, 200 μmol/L dNTP. Conclusion...