As a potent greenhouse gas with high global warming potential, methane emission measurement and inventory are the major challenges for the oil and gas industry in China to achieve greenhouse gas emission control and reduction. In this paper, recommendations on greenhouse gas inventory were raised based on the comparison among various inventory methods worldwide, and the methane emission studies during oil and gas production. Suggestions were made to improve the greenhouse gas inventory based on the status quo of the oil and gas production in China. For fugitive methane emission, it is recommended to update the emission factor embracing the change in oil and gas production process, such as reduced flaring period, application of green well completion, and distinguish between onshore and offshore production, etc., and encourage oil and gas companies to update the methane emission factors based on component level calculations or actual measurements. Both top-down and bottom-up methods are encouraged during methane emission measurements so as to make the measurements verifiable and repeatable. It should be cautious to extrapolate the local-based measurements to regional or national levels.