Abstract: Metering device is key to precise feeding in deep-sea cage auto feeding system. Difference in density and volume of various types of granulated feed, as well as constantly changing density of feed during feeding process cause inaccurate measurement and error in feeding system. Based on Coriolis mechanics, we designed a metering device that is not influenced by feed properties nor variation in gravitational field by establishing its framework, analyzing the measurement and calculation for the key parameters. The system uses DSP (digital signal processor) as control core, dynamically correcting measurement error and adopting PID control method to real-time control rotational speed by measuring and feedback-controlling the torque and rotation speed, so as to precisely control the meter-feeding. The device with simple structure, which meets the requirements of precise measurement and quantitative feeding of granulated feed, can obtain measurement precision of ±1% and range of measuremet of 0~15 t·h^-1, and is suitable for operations and management of precise feeding for intensive deep-sea cage aquaculture.