Abstract: Dongsheng Gas Field is the latest discovered "100 billion cubic meters" tight gas reservoir in the northern edge of the Ordos Basin. In order to solve the problems of complex collapse, low mechanical drilling speed, and high requirements for cementing integrity, key drilling and completion technologies were studied based on the analysis of engineering geological characteristics. Efficient prevention and treatment technologies for leakage and collapse was formed by optimizing the wellbore structure and developing KCl polyamine strong plugging drilling fluid system, KPD plugging slurry. Drilling speed enhancement technology for heterogeneous formation was formed by designing personalized PDC and drilling parameters, optimizing drilling tools, and supporting wellbore trajectory control technology. Horizontal well cementing technology for low pressure formation was formed by developing ultra-low density cement slurry, elastic and ductile anti channeling cement slurry, supporting technology of fully sealed cementing, efficient displacement, tail pipe suspension and reconnection processes. The above key drilling and completion technologies have been integrated and applied in 94 horizontal wells, reducing the average drilling cycle by 34.4% and the completion cycle by 32.1%, increasing cementing quality rate from 26.7% to 84.3%. The research and application results indicated that the key technology for drilling and completion in Dongsheng Gas Field has a significant effect on speed improvement and cost reduction, providing engineering and technical support for the economic development of tight gas reservoirs in the northern edge of the Ordos Basin.