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The unprecedented surge in global methane levels has raised global concerns in recent years, casting a spotlight on China as a pivotal emitter. China has taken several actions in recent years to curb the methane emissions, but their effects remain unclear. Here, we developed the Global ObservatioN-based system for monitoring Greenhouse GAses for methane (GONGGA-CH₄) and assimilate GOSAT XCH₄ observations to assess changes in China's methane emissions. We find the growth in China's methane emissions (0.1±0.3 Tg CH₄ yr⁻²) during 2016-2021 slowed down compared to the preceding years (2011-2015) (0.9±0.5 Tg CH₄ yr⁻²), in contrast to the concurrent acceleration of global methane emissions. As a result, the contribution of China to the global methane emissions dropped significantly. Notably, the slowdown of China's methane emission is mainly attributable to a reduction in biogenic …