In this paper,the effects of six kinds of different pH value and three kinds of different sodium silicate contents on soil potassium were studied by taking indoor soil column as the research subject and using yellow soil as meterial. The experimental samples were analyzed by UV spectrophotometer. The results showed that smaller the acidity was,or the greater the alkaline was,the greater available potassium content was.Moreover,the higher the sodium silicate concentration was,the higher available potassium c...