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This paper studies the SnCl2 Spectrophotometric Determination of Total Phosphorus. In acidic conditions, is a certain concentration of phosphate and ammonium molybdate the response generated using heteropoly acid. When adding a certain concentration of stannous chloride reductant, it will change into a blue complex. Color 15 min later than 20 mm color plate at 700 nm measured with the greatest absorption, the molar absorption coefficient k = 2.015 × 104 (L.mol - 1.cm-1) P 0 ~ 0.7mg / l within Beer's law is obeyed, and the detection limit of 0.008mg / l. Applied to the surface of orthophosphate