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This study was conducted to select the ozone tolerant individuals of Cornus controversa Hemsl., and touse malondialdehyde (MDA) content as an indicator of plant damage level for several oxidative stresslevels. Seeds of C. controversa were collected at 9 provinces in Korea. One-year-old seedlings weregrown in greenhouses and exposed to 100 pb ozone concentration for 8h day-1 for 10 weeks. At thetermination of ozone exposure, heights of seedlings were measured and MDA contents in the leaveswere analyzed. Tolerant, intermediate, and sensitive individuals were selected using the standardizedindices of height and MDA content. Height and MDA content of C. controversa exposed to ozone weresignificantly different among individuals and provinces. MDA content showed negative correlation(r=-0.531, p. 0.001) with height growth performance. Height and MDA content of tolerant individualspresented significant differences from those of sensitive individuals. As a result, MDA content may besuitable for the evaluation of the damage level of plants by oxidative stress.