Six caffeoylquinic acids of Cacalia firma (Komarov) Nakai (Compositae) leaves were identified using standard compounds by HPLC. Each content of those compounds in dried weight was determined as follows: 3,4-di-O-caffeoylquinic acid (1.44${pm}$0.04 mg/g of dried weight), 3,5-di-O-caffeoyl-muce-quinic acid (2.47${pm}$0.12 mg/g), 3,5-di-O-caffeoylquinic acid (3.74${pm}$0.24 mg/g), 5-caffeoylquinic acid (chlorogenic acid, 5.20${pm}$0.09 mg/g), 3-caffeoylquinic acid (1.35${pm}$0.01 mg/g) and 3-Op-coumaroylquinic acid (3.84${pm}$0.25 mg/g). The total content of six caffeoylquinic acids in the plant material was calculated as 18.05${pm}$0.69 mg/g while the percentage of the six compounds in the MeOH extract was calculated as 30.85${pm}$1.18%. The $IC_{50}$ value of the MeOH extract scavenging peroxynitrite ($ONOO^-$) was shown as 3.22${pm}$0.57 ${mu}g$/ml.