Nine sesquiterpene lactones, which were isolated from Hemisteptia lyrata Bunge, Chrysanthemum zawadskii Herbich var. latilobum Kitamura and Chrysanthemum boreale Makino were evaluated for the inhibition upon the nitric oxide release from the Raw cell and for the ACAT (acyl Co A: cholesterol acyltransferase) inhibitory assay. In the nitric oxide release inhibitory experiment, hemistepsin B $(IC_{50};=;0.05;{mu}g/ml,;0.15;{mu}M),$ cumambrin B, tulipinolide and costunolide exhibited strong inhibition with $IC_{50}$ values $0.05;{mu}g/ml;(0.15;{mu}M),;0.1;{mu}g/ml;(0.38;{mu}M),;0.2;{mu}g/ml;(0.69;{mu}M)$ and $0.2;{mu}g/ml(0.86;{mu}M),$ respectively. In the ACAT inhibitory assay, angeloylcumambrin B, tigloylcumambrin B, tulipinolide and costunolide exhibited strong inhibition with $IC_{50}$ values $33;{mu}g/ml;(95.4;{mu}M),;22;{mu}g/ml;(63.6;{mu}M),;38;{mu}g/ml;(151;{mu}M)$ and $17;{mu}g/ml(73.3;{mu}M),$ respectively, whereas other compounds did not exhibit significant activity against ACAT above $100; {mu}g/ml.$