Abstract: By using laser monitoring technique,the solubilities of p -toluic acid in N -methyl-2-pyrrolidone, N,N -dimethylformamide, N,N -dimethylacetamide,chloroform,acetic acid and water are measured in larger temperature intervals by synthetic method.As to the solubility of p -toluic acid in water,the experimental and literature data have satisfactory consistency.Given the solubilities of p -toluic acid, a solubility model is proposed. This model is verified by experimental and literature data, and the solubilities calculated by the model show good agreement with experimental and literature data.