Based on the watershed technique and the located observation method forest hydrology data in four consecutive hydrologic years from May 1989 to April 1993 were used for analysing water balance and geochemical cycling of nutrients in the regenerated tropical mountain rain forest ecosystem at Jianfengling, Hainan island. The results indicated that aver age annual rainfall was 2911. 0mm, 78. 88%, 7. 06% and 14. 06% of which were allocated to throughfall, stem flow and crown interception, respectively. The annu...