The flower of Campsis grandiflora K. Schum. Was extracted with 80% aqueous MeOH, and the concentrated extract was partitioned with EtOAc, n-BuOH and H$_2$O. From the EtO Ac fraction, seven triterpenoids were isolated through the repeated silica gel, ODS column chromatographies and preparative HPLC. From the result of physico- chemical data including NMR, MS and IR, the chemical structures of the compounds were determined as 3${eta}$-hydroxyolean-12-en-28-oic acid (oleanolic acid, 1), 3${eta}$-hydroxyurs-12-en-28-oic acid (ursolic acid, 2), 3${eta}$-hydroxyurs-12-en-28-al (ursolic aldehyde, 3), 2${alpha}$,3${eta}$-dihydroxyolean-12-en-28-oic acid (maslinic acid, 4), 2${alpha}$,3${eta}$-dihydroxyurs-12-en-28-oic acid (corosolic acid, 5), 3${eta}$,23-dihydroxyurs-12- en-28-oic acid (23-hydroxyursolic acid ,6) and 2${alpha}$,3${eta}$,23-trihydroxyolean-12-en-28- oic acid (arjunolic acid, 7). These teriterpenoids were isolated for the first time from this plant. Also, compounds 4, 5, 6, and 7 revealed relatively high hACAT-1 inhibitory activity with the value of 46.2${pm}$1.1, 46.7${pm}$0.9, 41.5${pm}$1.3 and 60.8${pm}$1.1% at the concentration of 100${mu}$g/mL, respectively.