In order to study the toxic level of dietary trivalent chromium and its interaction with cobalt and zinc on the growth, mortality, and accumulation of chromium in organs of chicks, an experiment was conducted with 720 chicks(Hanhyub 603) for a period of S weeks. Lour levels of trivalent chromium(0ppm, 500ppm, 1,500ppm and 2,500ppm) were added in the absence or presence of cobalt 150ppm or zinc 600ppm. The results obtained from the experiment are summarized as follows: 1. Growing chicks(0-5wk) fed 500ppm of trivalent chromium showed no adverse effects on the growth rate and mortality, but those fed 1,500ppm to 2,500ppm of trivalent exhibited considerable growth depression(p$lt;0.05) without mortality. 2. Dietary cobalt and zinc did not reduced the toxicity of trivalent chromium. 3. Chromium accumulation into internal organs was slightly increased as the dietary trivalent chromium level was increased from 500 to 2,500ppm, but the degree and mode of the accumulation was different depending upon the internal organ. And adding cobalt and zinc failed to reduce the chromium accumulation.