the lag phase in lipid peroxidation processes reflects the antioxidant status of membrances and lipoproteina, and as a corollary , their resistance to oxidation. Fig.2 shows the relationship between the concentration of Chrysanthemi Flos and the lag time of LDL oxidation . This result shows that the lag phase of LDL oxidation is concentrations ranging from 6.7 ml to 20 ml. As shown in Fig. 2,the lag phase was lengthened up to 150 minutes and 205 minutes at concentrations of 10 ml and 20 ml ,respectively.