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Lean combustion is an efficient technology for low pollutant emissions and high efficiency engines. However, the relatively low flame propagation speed makes it difficult to achieve stable combustion in lean burn regime. Electric field assisted combustion is considered as a very promising and attractive approach for improving the lean combustion and enhancing flame propagation. In this work, effects of direct-current (DC) electric fields on the flame propagation and combustion characteristics of lean premixed CH4/O2/N2 mixtures were experimentally investigated at excess air ratios of 1.2, 1.4, 1.6, and 1.8, room temperature and atmospheric pressure. Results show that the existence of the DC electric fields significantly affects the flame propagation and combustion properties.