Abstract: An ink pump control system for an ink pump installed on printing presses, driven by a stepping motor, with the ink feed thereof being controlled in accordance with the revolution of the stepping motor, including a first pulse output device for outputting a pulse signal proportional to the operating speed of the rotary press, a memory device for storing ON/OFF bit strings in accordance with a printing element ratio of a plate surface area to which ink is to be fed obtained in advance by a printing element ratio measuring device, a second pulse output device for sequentially reading each bit in the ON/OFF bit string stored in the memory device every time a pulse signal outputted by the first pulse output device is inputted, and outputting a pulse signal in accordance with the read bits, and a motor driver for operating the stepping motor in accordance with the pulse signal outputted by the second pulse output device, so that ink feed is controlled optimally.