In this paper, the effects of rainfall on nutrient import and export in the broad-leaved evergreen forest in southwest Yunnan Province have been observed. The results show that in the proress of rainfall the nutrient import in rainfall is mainly N and the major elements of nutrient import in throughrain are P,K and Mg. They orcupy 69.85%, 77.33%, 98.19%,and 80.40% of the total nutrient import respectively. Ca occupies about half of the total nutrient import in rainfall and throughrain and the percentages are 45.35% and 54. 38%respectively. The major form of nutrient export is soil percolation. N, P, K, Ca and Mg occupy 96. 52%, 86.79%, 69.13%, 98.17% and 97.21% of the total nutrient export respectively. In nutrient cycle,N, P, K and Ca increase 15. 94kg/ha. a, 0. 353kg/ha. a,3. 83kg/ha. a, 1. 26 kg/ha. a. respectively,but Mg reduces 0. 654 kg/ha. a.