Under the "dual carbon" goals，gas-fired power，with its high efficiency，flexibility and cleanness，has become a crucial backbone power source for building a new-type power system. Focusing on the construction needs of large scale new energy bases in desert-gobi-wasteland regions of Xinjiang，this research considers the natural gas abundance of Xinjiang and systematically analyzes the regulation flexibility of gas-fired power，compared to coal-fired power，from a techno-economic perspective. Typical operational scenarios for desert-gobi-wasteland large scale new energy bases are designed，and shares of green electricity and carbon emission intensity are calculated in cases of different power source configurations. Moreover，this research quantifies the economic indicators and environmental benefits of gas-fired power and demonstrates the feasibility of gas-fired power as a superior backbone power source for such bases. The results show that introducing gas power into the base can significantly increase shares of green electricity by approximately 14% and reduce carbon emission intensity by about 75%，compared to the case of coal power. It is confirmed that gas-fired power offers notable advantages in enhancing new energy integration of the base，ensuring system security，and increasing proportions of clean electricity for transmission. The findings of this research provide a reference case balancing economic viability with ecological value for solutions to constructing clean energy bases in desert-gobi-wasteland regions.