The erythrocytes agglutination test was applied to the common korean plants for lectin activity screening by using human blood. During the four years, 108 species from 46 families of floras were collected, identified and subjected to the test after being divided into several different parts. Only 13 species demonstrated strong lectin activities. Meanwhile 66 species did not shown any agglutination. All others were observed as having low activity or as having hemolytic constituents.