Abstract: According to the requirements of water and fertilizer management for the cotton drip irrigation under mulch film, based on developing fertilization models and schemes, the system of proportionally-mixed variable rate fertilization suitable for cotton drip irrigation under mulch film was developed. The system has three functions of programmable control (PLC), computer programmed control (CPC) and remote control (RC). It can reach variable rate fertilization control, the control section working pressure is 24 voltage, and was driven by water without power. Finally, the fertilizer utilization efficiency increases by more than 10%.