Abstract E2POT Nonvolatile Digital Potentiometer is a typical one among the Digital Potentiometers of Xicor company’s products. The characteristics, working principle, and the technology of using E2 POT Nonvolatile Digital Potentiometer in electronic fuel injection for the dual-fuel engine for power unit of irrigation machinery were introduced. The injection pulse length was controlled hy using an anti-lose-easily rheostat X9221 and a monostable trigger 14538. Due to the anti-lose-easily characteristic of X9221, the ECU is more reliable. At the same time ECU has the features of simple structure, convenient accommodation ete.