The experiment was conducted to determine the calcium and phosphorus requirements for White Leghorn growing chicks of 8-18 weeks of age. Chicks hatched in September were used in this experiment. Basal diet was primarily composed of yellow corn and soybean meal without any animal protein source, containing 0.45 total phosphorus (all plant phosphorus)and 0.2% calcium. Four experimental diets of 0.45% and 0.60% phosphorus levels, with 0.5% and 1.0% calcium levels to each phosphorus levels, were fed in the experiment. It was found that dietary calcium and phosphorus levels during growth in 8-18 weeks of age in this experiment, did not significantly affect body weight gain, feed efficiency and tibia ash content. It was concluded that calcium and phoshorus requirements for White Leghorn growing chicks of 8-18 weeks of age were 0.5% and 0.45%, respectively. These were much lower than what were recommended by National Research Council. It appears that the whole amount of dietary phosphorus to the level of requirement(0.45%) can be supplied with plant phosphorus.