In the present study, we aimed to detect and quantify cyclo-dopa amides in Portulaca oleracea L. Together with four known ones （oleracein A-D）, we further identified eight new cyclo-dopa amides, named oleracein H-O, using an HPLC-DAD combined with an improved HPLC-ESI-MS/MS method. A standardized HPLC fingerprint of cyclo-dopa amides was generated for the first time through analyzing 11 batches ofP. oleracea. Simultaneously, the contents of two major amides, oleracein A （OA） and oleracein B （OB）, and the total amides （TID） were determined. Our results showed that the contents of OA and OB of P. oleracea ranged from 35.00 to 151.93 mg/kg and from 40.00 to 150.44 mg/kg, respectively. Moreover, TID ranged from 314.16 to 928.60 mg/kg （calculated by OA）, or from 475.83 to 1393.00 mg/kg （calculated by OB）. Taken together, our newly develooed method could be used for the aualitv assessment and oualitv control of this herb.
