Some senescence physiology characteristics of flag Leaf in colored rice, such as the content of chlorophyll and soluble protein and the SOD activities, were studied under five different densities with two colored rice of black glutinous and red japonica. The results indicated that with increasing planting density, the content of chlorophyll a and b, the soluble protein content and the SOD activities were decreased, but the ratio of Chla-Chlb and MDA content were increased, and these senescence physiology characteristics of E treatment were deceased with a large variation scope and early senescence of flag leaf. These results suggested that chlorophyll content, MDA content and the SOD activities are correlated significantly to density resistance of colored rice.