With the “Dual Carbon” goal of China, hydrogen-blended natural gas via pipeline transportation technology has attracted widespread attention from domestic and foreign scholars. This paper focuses on the economic feasibility analysis of hydrogen-blended natural gas technology in three situations. The results show that for the situation measured by energy, the cost price of hydrogen is required to be 28.6–37.5% of the cost of natural gas, and when measured by volume, the cost of hydrogen needs to be not higher than natural gas for the natural gas marketing companies to city gas. For the city gas companies to consumers, in order to ensure that the cost of user remains not increased, for per one percent hydrogen, the price of natural gas needs to be reduced by 0.63–0.72%; to ensure that the profit of city gas is not decreased, when the hydrogen percent is 5–20%, the cost of hydrogen should be lower than the sum of natural gas cost and 0.62–0.63 times the profit per cubic meter of natural gas; To ensure both of the cost of terminal consumers and the profit of city gas are invariable, the cost of hydrogen needs to be 37.1–38.1% lower than natural gas for city gas, And the price of hydrogen blended natural gas sold should be decreased more than 0.63–0.72% per one percent hydrogen blended in natural gas. When the carbon tax is 50–500 yuan/ton, the economic price of the gas will be adjusted by 0.029–0.38 yuan/m3.