Soil organic matter contents, pH values and heavy metal contents of agriculture soils in Hainan were studied to disclose their correlationships. Results showed that organic matter contents of almost all soils were at middle or low levels with a mean of 22.99%, significantly different in space; that the mean pH value was 5.20, and the mean contents of five heavy metals all were not higher than the 2nd grade in the national soil environmental quality standard, but the max contents of Hg, Cd and Cr exceeded it, the concentrations of Hg, Cd and Cr being 1.63, 0.64 and 586.70 mg/kg, respectively. The relationships between soil heavy metals and soil organic matter contents and pH were complicated.