The effects of electric ifelds on the natural gas laminar premixed lfame were investigated under lean combustion condition to promote the lfame propagation and improve the lfame combustion speed and stability. Experiments were conducted in a constant volume combustion bomb under the room temperature and atmospheric pressure conditions to analyze the effects of DC and AC electric ifelds on the lfame shape, combustion pressure, the pressure rise rate, and lfame combustion duration. The results show that the peak combustion pressure increased by 6.96%, 8.84%, 10.50%, 13.78%, and 14.40%and peak pressure arrival time were shortened by 14.67%, 13.58%, 18.93%, 25.41%, and 27.97%when the DC electric ifelds of-5 kV and AC electric ifelds with the voltage virtual value of-5 kV and frequencies of 5, 10, 15, and 25 kHz were applied at the excess air ratio of 1.6, the lfame was stretched with the applied voltage. Initial duration was shortened signiifcantly with the applied voltage. Therefore, AC and DC electric ifeld have a promoting effect on the lfame, and the high frequency AC electric ifelds for the promotion of lfame are better than that of DC electric ifelds. These results wil be helpful to the theory research of alternative fuel vehicles engine combustion process.%为了提高天然气燃烧速度，促进火焰传播，提高火焰稳定性，研究了稀燃条件下电场对层流预混火焰的影响。进行了常温、常压下的定容燃烧弹试验，分析了负电场和高频交流电场对天然气/空气预混稀燃火焰形状、燃烧压力、压力升高率、火焰燃烧期的影响。结果表明：过量空气系数1.6下，加载交直流电场均使火焰发生形变；当加载直流－5kV电场与有效值为5kV频率5、10、15和25 kHz交流电场时，燃烧压力峰值分别增大6.96%、8.84%、10.50%、13.78%、14.40%，峰值到达时间提前14.67%、13.58%、18.93%、25.41%、27.97%；加载交直流电场，主要使火焰初始燃烧期缩短。交直流电场对火焰均有促进作用，且高频交流电场对火焰的促进作用优于直流电场。
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