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Abstract. In order to improve the working efficiency of forest-fruit vibration harvester, the effect of fruit uneven distribution on fruit tree modal was studied by using Finite Element method. Three-dimensional model of a typical spindle fruit tree was established, and the uneven distribution of forest-fruit on the fruit tree was simulated by changing the density of branches in different positions of the fruit tree when the overall mass of the fruit tree kept unchanged. The first 10 order natural frequencies and vibration modes of fruit trees under different forest-fruit distribution conditions were studied. The results showed that forest-fruit distributions had significant effects on both natural frequencies and vibration modes of the fruit trees. The natural frequencies of the fruit trees became smaller when the forest-fruits were distributed mainly in the higher position, while the effects of forest-fruit distributions in horizontal direction on natural frequencies were different in different orders. The first 10 order natural frequencies of fruit trees were ranged from 7.61Hz to 66.37Hz, and the optimal response states mainly focused on the 5th order, 6th order and 8th order modals. The results can provide theoretical reference for the design of forest-fruit vibration harvester.