Objectives of this study were to investigate the size reduction procedure of fruit branch, to develop a tractor mounted fruit branch mill and to evaluate the machine performance. The study was conducted at the Development of Agricultural Machanization Faculty of Agriculture at Bangpra Sriracha, Chonburi. A tractor mounted fruit branch consisted of chopper knife and hammer mill, it was tested with santol mango, santol and rambutan and three average ranch diameters of 1 3 and 5 centimeters were used at the speed of 1500 rpm. The results showed that an increase in dameters of all kinds of fruit branch increased the capacity of the machine. However, the modulus of fineness and the average particle size were approximately the same. The machine was easy to operate and transport in all field conditions. The findings also revealed that the cutter mill was suitable for 3-5 centimeters fruit branch while 1 centimeter diameter fruit ranch was better to mill leaf residued by hammer mill which gave higher capacity.