Compared with the position fixed fish feeding machine, shrimp feeding requires bait spread evenly across the whole pond water surface since its domain characteristic and low activity ability. There is less feeding machine that can meet this goal. To solve this problem, in this paper, a throwing tray is designed based on the bait particles moving curve simulation and experiment, which can achieve even spreading of the bait. A new feeding machine is upgraded to meet the requirement of installation and operation on the boat. The driving system and power source is calculated and assembled. Experiment has been conducted in the practical shrimp cultivation and the performance result shows its validation.