A design scheme of bag making machine control system by ARM core embedded processor was introduced. The control system was divided to two subsystems based on high reliability and powerful data processing ability of ARM core processor. Fixed length and position subsystem is composed with single chip microcomputer DSPIC, AC servo driver and main motor. Tension control and photoelectric rectification is another independent subsystem. The practical running results showed that the scheme effectively improve the precision of the control system; compared to those bag-making machine control system using PLC or industrial computer, the control system is faster, more precise and more stabile.