Abstract:Contents of four heavy metal elements (As, Hg, Cd, Pb) in soil (year 1989, 1995, 1998, 2001) in a long-term fertilization experiment were investigated. The results showed that the contents of four heavy metal elements were increasing along with cultivation time as a whole and the increase varied in the order of Hg ﹥ Cd ﹥ Pb ﹥ As. All the four elements investigated, however, had not exceeded the first grade criteria of the national standard for environmental quality by 2001. Concentration of Hg or Cd differed between fertilization treatments. Fertilization was the main cause for increase of heavy metal elements in the soil, especially application of P fertilizer. Positive correlations between the four heavy metal elements contents in soil were found, which indicates similarity of the heavy metals in source and environmental behavior.