[Objective] To study a method for simultaneous determination of total phosphorus and total potassium in soil. [Method]According to the range of the standard curve of the instrument,choosing the appropriate dilution multiple,the phosphorus and potassium content in the digestion solution were determined to complete the determination of total phosphorus and potassium in soil samples. [Result]The linear coefficients of phosphorus and potassium were 0. 999 9 and 1. 000 0,respectively. The standard soil samples c...