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A dual-carbon target (i.e., carbon peak and carbon neutrality) has been a critical external factor for the usage of China's fossil energy in the future. As the lowest-carbon fossil energy source, the uncertainty of China's natural gas usage is much higher than that of coal and oil. Thus, a detailed analysis of China's future natural gas consumption (NGC) under the dual-carbon target has attracted great attention from academia. This paper constructs a system dynamics-based forecasting model for China's NGC, and predicts the trends of China's primary energy demand, natural gas demand, and carbon emissions under four scenarios of high-, medium-, low-, and business-as-usual transitions. The low transition scenario, which is in line with the actual situation of China, shows that: (1) primary energy consumption peaks around 2040 at approximately 7 billion tons of standard coal equivalent. (2) Carbon dioxide emissions peak in 2030 at approximately 10.6 billion tons of carbon dioxide, and "net zero" carbon emissions will be achieved in 2057 and 2059 under high and low carbon sinks, respectively. (3) NGC is expected to peak in 2038 at approximately 630 billion cubic meters. (4) Industrial gas is expected to peak around 2035 at approximately 450 billion cubic meters. • We predict medium- and long-term natural gas consumption in China. • We construct a system dynamics model considering the bind of dual-carbon target. • We apply scenario analysis to quantify the intensity of low-carbon transition. • We get results of prediction the peak natural gas consumption in China. [ABSTRACT FROM AUTHOR]