Detect the current heavy metals in soil digestion process cumbersome and can not be unified Preparation digestion fluid problem, the study used nitric acid, nitric acid - hydrofluoric acid and nitric acid - hydrofluoric acid - hydrogen peroxide system separately for the three National soil standard samples GSS-3 and GSS-9 for microwave digestion, and optimize the digestion method and digestion conditions. We explored the HNO3(5)-HF(2) Preparation for the unification of digestion fluid ideal soil samples digestion condition, the best time for acid temperature was 170℃. This method could simultaneously digestion and determination of eight heavy metal elements, applicable to the determination of a large number of soil samples with a simple, rapid, accurate, less interference, etc., greatly enhance the work efficiency.