Under the "dual-carbon" context

accurate assessment of gas network states under hydrogen blending is crucial for energy system transformation. This paper proposes a steady-state analysis method for hydrogen-blended gas networks based on gas composition tracking

aiming to address the shortcomings of existing models in terms of physical rationality

numerical stability

and applicability. Specifically

a concentration model is introduced to track gas composition under multiple and varying hydrogen injection conditions. Additionally

the traditional hydraulic model is systematically revised

and a generalized pipe pressure drop equation applicable to various pressure levels is established. Furthermore

an alternate-joint solution strategy based on the Newton loop-node method is developed to resolve initial value selection and convergence issues arising from traditional gas network analysis methods. The effectiveness and numerical stability of the proposed model are demonstrated through an illustrative example and a practical gas distribution network

highlighting the strong engineering applicability potential of the proposed method in real-world gas network analysis.