Abstract: Under simulated operating conditions, new multi-functional testing dust remover and electrical low pressure impactor (ELPI), etc. were used to conduct experiment study on the low-low temperature electrostatic precipitator (ESP) technology for the fine particle (such as PM₁₀, PM_2.5, PM_1.0) and dust. The results showed that PM₁₀, PM_2.5, PM_1.0 and dust removal efficiencies were significantly higher at lower inlet flue gas temperatures (67-68 ℃)than that at higher inlet flue gas temperatures (86-89 ℃). At lower inlet flue gas temperatures, as the inlet flue gas flow rate decreased, the extent of increased fine particle and dust removal efficiencies was more significant, which indicated that as inlet flue gas flow rate decreased, the residence time of fine dust in the electrical field extended, thus more convenient to collecting fine particle and dust for low-low ESP.