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Leaves of surian tree ( Toona sinensis ) based on the research, can be used for medications, such as diabetes, cancer, and others. At the present the people is being switched from chemical drugs to herbal medicines. Therefore, surian leaves is one source of herbal medicine to be developed in the future. However, information of leaves biomass in each tree relating to ages and tree parameters is unknown. This study aims to determine the weight of surian leaves on each tree and to examine the relationship of leaves weight with several tree dparameters. The study was conducted on private forests in Sumedang District. The sample of 110 trees were taken purposively. Tree parameters were measured, namely: Diameter Breast Height (DBH), total height, timber height, crown height, crown diameter, age, and leaves weight of each tree. The results of the correlation analysis showed that there was a significant relationship between four parameters of the tree, namely DBH, total height, crown height, and crown diameter with surian leaves weight. The highest correlation with the weight of surian leaves is DBH, amounting to 0.75. Estimated weight of leaves in DBH 10-19 cm is 8-11 kg/tree. Whereas for DBH above equal to 20 cm is 18-23 kg/tree.

Estimation and Correlation of Surian Leaves (Toona Sinensis) Weight with the Tree Parameters