Abstract: The relationship between botanical phosphorus intake in the diet of Simmental hybrid replacement heifers and the apparent digestible phosphorus. 24 healthy Simmental hybrid replacement heifers were randomly divided into 6 groups,and there were 4 heifers in each group. The concentrate diet with 6 different levels of phosphorus was fed to each heifer according to 3.50 kg/d,while crude fodder was fed freely. The dietary P content was 0.36%,0.40%,0.42%,0.46%,0.50% and 0.54% on a dry matter（DM） basis,respectively. The total experimental period was 30 d;the normal test comes after 20 d raise period,and fecal samples and urine samples were collected during the last 7 days. The contents of phosphorus and dry matter in diet and fecal samples were determined,and then the regression relationship between phosphorus excretion in fecal samples and botanical phosphorus intake in diet. Results showed that the apparent digestible phosphorus in digestive tract were significantly different（P0.05） from the different treatment of dietary phosphorus intake. To increase dietary phosphorus would be increased fecal phosphorus excretion. However,the apparent digestible phosphorus in digestive tract possessed a parabola function relation with phosphorus intake. The maximum amount of apparent digestion and apparent digestibility in the total tract were 10.5 g/d and 40.8%,respectively.