This experiment was conducted to evaluate the chemical compositions and to determine the feeding value of sea weeds collected from Seogwipo, Cheju Island for growing chicks. 180 single comb white leghorn chicks were allotted for 2 treatments according to the lev els of sea weeds in their ration such as 5% and 10% on air dried basis. Body weight gain, feed consumption and feed efficiency in each treatment were measured. The results obtained are summarized as follows: 1. The sea weeds variable contents in crude protein, crude fiber, crude minerals, iodine and calcium content, but no difference was observed in crude fat, N.F.E. and other mineral elements among sea weed samples. 2. In body weight gains, the statistical significant diffence (p$gt;0.01) was observed between the control lot and the treatments, but there was no significant difference between T1 (5%) and T2(10%). However, until 3 weeks of feeding periods there was no significant difference between the control lot and T1 (5%) and from 2weeks of feeding there was statistical difference (p$lt;0.05) between the control and T2(10%). 3. In feed intake, no difference was observed between the control lot and the treatments. In feed efficiency there was statistical difference (p$lt;0.05) between the control lot and treatments but there was no difference between T1 (5%) and T2(10%). 4. From the above results, it runs estimated that sea weeds could be supplemented by 5% of the chicks ration without exerting any apparent adverse effects on the growth up to 3 weeks of feeding.