Abstract: In order to realize the economical and high-efficient development of the M tight sandstone gas reservoir in Canada, technical studies and innovations about layer subdivision, optimization of operation parameters during drilling and completion, optimal and fast drilling, post-frac flowback, and multi-well pad development were conducted. In this way, the key technologies integrated geology and engineering were formed, including a layer subdivision technology of a super thick sandstone reservoir, a match technology of operation parameters during drilling and completion by machine learning and big data analysis, optimal and fast drilling of horizontal wells with low costs, well-soaking flowback, as well as 3D multi-well pad development, etc. After field application, these technologies sharply increased the drilling and completion efficiency with evident decreased development costs. Further, the single well witnessed a remarkable increase in productivity, and achieved significantly increased efficiency and reduced costs. The successful development of the M tight sandstone gas reservoir has provided a technical reference for high-efficient development of unconventional reservoirs in China.