This experiment is aimed at developing a mathematical model in order to estimate fertilizer value of raw swine slurries based on nutrients intake. Data of nutrient contents in diets and in slurries were obtained by feeding experiment and analyzed. One-way ANOVA analytical results of the experiment show that the effects of different diets on the content of total nitrogen in pig feces, urine and manures are significantly different; the effects of different diets on the content of potassium in pig urine and manures are significantly different; the effects of different diets on the content of phosphorus and ammoniacal nitrogen in pig slurries are not significantly different; the effects of different diets on the percent of phosphorus in pig feces are significantly different. The results f linear regression analysis show that crude protein intake can be evaluated for estimating the content of total nitrogen in pig feces, in pig urine and in pig manures; potassium intake can be evaluated for estimating the content of potassium in pig urine and in pig manures; phosphorus intake can be evaluated for estimating the percent of phosphorus in pig feces.