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Ni 10 La x /MAO catalysts with high Ni dispersion was prepared by wet impregnation method. Characterization results showed that metal dispersion of Ni obviously improved on catalyst surface after La doping. Under the long-term reaction conditions (800 °C, 10 h), Ni 10 La 5 /MAO catalyst could exhibit the highest catalytic performance (93% of CH 4 conversion, 71% of CO 2 conversion and less than 3% activity loss) with lower Ni particle size (12.6 nm) and carbon deposition (8.9 %). [Display omitted] • La doping significantly increased the content of active species Ni0. • High dispersion of Ni species efficiently inhibited the growth of carbon. • Ni 10 La 5 /MgAl 2 O 4 catalyst owned the highest catalytic activity and stability in methane bi-reforming system. Ni-based catalysts were widely studied for methane reforming system in the past decades, while catalytic deactivation by carbon deposition and metal sintering limited its industrial application life. In this work, La-promoted Ni/MgAl 2 O 4 catalysts were investigated over methane bi-reforming reaction, and significantly improved the activity and stability of catalysts. Multiple characterizations showed that the introduction of La increased the content and dispersion of active species (Ni0), providing sufficient sites for methane adsorption and dissociation. Besides, smaller particle size of active metal (12.6 nm) was proved to inhibiting carbon accumulation on catalyst surface. Ni 10 La 5 /MgAl 2 O 4 catalyst was found to exhibit the highest catalytic performance (93% of CH 4 conversion, 71% of CO 2 conversion and less than 3% activity loss) under long-term reaction conditions (800 °C, 10 h). This work will provide important guiding significance for the design of high-efficiency methane reforming catalysts. [ABSTRACT FROM AUTHOR]