Abstract: Abstract: In order to meet the maximum feed intake of lactating sows and achieve accurate feeding control requirements, a new generation of automatic feeding control system of lactating sows was designed in this study. The automatic feeding control system consisted of control panel, storage bin, quantitative bin, ejector retainer plate, linear actuator, buffer spring, upper blocking ball, subjacent blocking ball and connector between feed delivery tube and storage bin. In terms of control panel, the main components included microprocessor chip, commands input circuits, data communication circuits, data storage circuits, data display and external drive circuits. The form of stack data was applied in data storage system, and all feeding data in two months can be stored in this system under the situation that pigs were fed four times a day. Besides, the combination of the electric push rod and control panel constituted the upper part of storage bin; the loading feeder system and unloading equipment were connected by the upper part of storage bin; the main body of storage bin (cylindrical and inverted cone section) and quantitative bin were coordinated by electric push rod to unload feed. Through this design, the feed system was compact, energy saving, less feed loss and easy maintenance, which is in line with the development trend of intelligent agricultural machine. To obtain a stable discharge of feed by this system, the control of linear actuator's operating rate, and the coordination between input voltage and power was studied. In addition, the accurate feeding amount to lactating sows was realized by using the preset individual feed intake model and the precise control technology on variable volume. The results showed that: 1) the feed discharge control system mainly consisted of the quantitative feed bin, linear actuator, the upper plugging ball and down plugging ball, and the embedded control system. 2) The feed discharge stability test showed that starting voltage of linear actuator varied slightly and the precise of feed discharge amount wasn't affected when the electric power supply was 150 W. Besides, when the electric push rod rate was 60 mm/s, the input voltage was 11.5 V, the feed discharge was more precise and stable (P<0.001, CV=3.526%). 3) The preset feed intake curve was consistent with the feeding characteristics of lactating sows, and the feed intake curve was converged to the logarithm curve (R2=0.9609). 4) Compared with artificial feeding, the automatic intelligent feeding system improved feed intake of sows when the feeding curves was preset and feeding frequency was four times per day. The maximum of feed intake was achieved when sows were fed at different feeding time interval (06:00, 10:00, 15:00 and 22:00) and different amount of feed (30%, 20%, 20%, and 30% for each feeding, respectively) in a day. In conclusion, the new generation of automatic feeding system integrated the linear actuator equipment and embedded control system, and it had the advantages of easy operation for farms, accurate and stable feed discharge, and lower cost compared with imported equipment and traditional equipment with auger delivery. Therefore, the automatic feeding control systems suitable for popularization and application in the big, medium and small pig farms in our country.