This paper introduced methods of chemical analysis applied to the determination of the organic fertilizers nitrogen,phosphorus and potassium levels.Namely,the samples being digested by acid hydrogen peroxide-rapid azot ometered,the solution could be prepared.Using NC-2 mode rapid azotometer to determine nitrogen levels,quinoline phosphomolybdate gravimetric analysis method to phosphorus levels,and KTPB gravimetric analysis method to potassium levels.During the process don't need to use spectrophotometer and flame photometre.It was adapted for the compound fertilizer factories.Samples with levels over 0.1 percent respectively could be determined by using this method and its accuracy and precision could satisfy the requirement of the productions.