To investigate the protein spraing effect of dl-methionine and 1-lysine, this experiment with a total of 288 egg laying chickens of Hi-Sex strains was carried out for a period of 14 weeks. Eight treatments of (1) control(starter ration: crude protein 20%, growing chickens ration: crude protein 16%), (2)basal starter ration: crude protein 18%, growing chickens ration: crude protein 14%). (3) basal+lysine 0.1%, (4) basal+lysine 0.2%, (5) basal+methionine 0.1 %, (6) basal+methionine 0.2%, (7) basal+lysine 0.1%+methionine 0.1%, (8) basal-lysine 0.2%+methionine 0.2% with 3 replicates were employed in this experiment. Metabolism trial was conducted at the end of starting and growing chickens feeding trials, respectively. The obtained results are summarized as follows: 1. Body gain was highest in the methionine 0.1%+lysine 0.1% treatment for starter chickens and next was in the methionine 0.1% treatment. In the growing chickens, the methionine 0.2% and methionine 0.1% treatments had the higher body gain than other treatments. 2. Diet intake was slightly lower in the lysine 0.1% and methionine 0.1% trey tments than in the other treatments for starter chickens. In the growing chickens, control and lysine 0.2% treatments consumed less feed than other treatments. 3. Feed efficiency was more improved in the lysine+methionine 0.1% and methionine 0.1% treatments than in the other treatments for starter chickens. In the growing chickens, control and methionine 0.2% treatment showed the better feed efficiency than other treatments. 4. In the nutrient utilization, methionine 0.1% treatment was the highest. among the treatments. This result was almost same with the result of feeding trial. In the growing chickens, lysine 0.1% treatment was the highest among the treatments. 5. In the economical analysis, the feed cost per kg body gain was less in the lysine 0.1% and methionine 0.1% treatment than in the control. The feed cost per ㎏ body gain of basal treatment was also less than control. Therefore, considering the body gain and meat production cost simultaneously, lysine 0.1% and methionine 0.1% treatments were most profitable among the other treatments. According to the results of this experiment, it may be concluded that supplementation of l-lysine and dl-methionine at the level of 0.1-0.2% which are generally known as two limiting amino acids in the starting and growing rations would be able to spare about 2% of dietary protein (4 % soybean oil meal or 3% fish meal).