Abstract this paper applies the theory of value flow control to rolling copperplate in single rolling mill in order to achieve auto gap controlling and improve precision of copperplate in rolling by applying virtual instrument in this progress. With the introduction of value flow control and other theories, we can conclude that the value flow control based on LabVIEW emulator can further improve the manufacturing precision of rolled copperplate. KeyWords:value flow control;Virtual Instrument; Labview ;emulator; AGC