Feeding and metabolism trials were conducted to determine the effect of canon exchange capacity of zeolite added in broiler`s diet on growth and nutrient utilization. The 234 chicks were randomly allocated to triplicate 6 treatments. Metabolism study was carried out by 30 chicks (5 chicks each treatment). The control diet contained no zeolite, but experimental one contained 3% zeolite or grit. The tested zeolite possessed 40, 60, 80 or 100 me/100g canon exchange capacity. The whole rations were adjusted to have iso-calorie and -protein. The results obtained were as follows: 1. Average weight gain of broilers showed no significant difference among treatments for 8 weeks. However, somewhat higher gain in zeolite or grit block was noticed compared to that in control. 2. Feed consumption represented no significant difference among treatments. 3. Feed required for Kg body weight gain in zeolite or grit group was slightly less than that in control, however, the difference was not significant. 4. Feed cost for body weight gain in zeolite or grit treatment was lower than that in control. 5. Utilization efficiencies of dry matter, crude protein, ether extract, calcium and phosphorus appeared to have similar values among treatments. However, carbohydrate utilization was improved by zeolite or grit supplementation. 6. Moisture contents in excreta from zeolite-fed chicks were less than that from control chicks, bur no significant difference was recognized. Those from grit-fed brids were more than that of control. 7. Ash contents in diets including zeolite or grit were very high (8-9%).