According to the requirements of numerical control of ink flow and its technology theorem, the mechanical structure of numerical control ink fountain and the three-dimensional solid model for offset press was designed. The rationality of ink fountain design was verified. Overall control circuit project were designed, the hardware control system was made using ATMEL-AT89S52 singlechip as control component, and using step motor as the implementation object. According to the principle of ink adjusting, control software for the control system was programmed.