Quantitative methods for the marker compounds of Cimicifugae Rhizoma, Achyranthis Radix, Artemisiae Capillaris Herba, Moutan Cortex Radicis and Arecae Semen, respectively, were developed using HPLC-DAD. Using the established methods, each extract of the natural medicines were evaluated. In addition, long term and accelerated stability test in the extracts were examined for six months. No significant change in content of the marker compounds of each extract observed during the time of investigation.