Abstract: This paper evaluates the soil fertility of dark red humid ferralsol for rubber plantation in Hainan province. The evaluating results indicate the soil fertility of dark red humid ferralsol for rubber plantation is low in different tapping years, and the integrated evaluation index is from 0.24 to 0.50. In different tapping years, the integrated evaluation index of soil fertility is 0～10 years（0.26）＞30～years（0.24）＞10～20 years（0.23）＞20～30 years（0.23）, all of these are under 0.4. In different latitude, the integrated evaluation index of soil fertility is Haikou（0.35）＞Lingao（0.25）＞Chengmai（0.24）＞Wenchang（0.23）, and in different longitude is Dingan（0.50）＞Haikou（0.35）＞Qionghai（0.34）＞Wanning（0.23）. The integrated soil fertility in different tapping years and region is inferior.