In recent years, non-pillar coal mining technology represented by entry retained along gob side with flexible bag concrete wall has been widely applied in Shendong mining area. Although the technology has good applicability, there are still some problems, such as low mechanization degree, high labor intensity, high pressure of auxiliary transportation, poor working environment and discontinuous working face continuity. In view of these problems, roadway design and equipment layout was optimized with remote power supply technology. Emulsion pump station, mobile substation and their power supply equipment were installed outside the transportation roadway to share working-face equipment and reduce equipment relocation, which shortened material transportation distance and increased safety space for transportation and pedestrians. That reduced the time-space interference between gob-side entry retaining and coal mining operations. The method of hydraulic fracturing or blasting pressure relief is applied to reduce the mining pressure appearance of roadway retained area, reduce support input and expand the scope of gob-side entry retaining. To reduce labor intensity and improve supporting effect, special supporting materials such as anchor-embedded and shear resistant anchor cables, and special supporting equipment such as gangue shield and unit (portal) bracket, were developed to comprehensively replace the traditional “one beam with four columns” scaffolding support. To improve the quality and production efficiency of concrete, present mixed concrete was replaced by ready-mixed concrete. Special vehicles for concrete transportation were developed to reduce segregation and throwing in the process of concrete transportation, improve transportation efficiency. The new design flexible bags and thin spray materials were applied to reduce air leakage channels. The ventilation mode of working face was changed to strengthen disaster prevention and treatment for better safety guarantee ability. The new technology has changed the traditional low-efficiency, high-risk and labor-intensive retaining technology, which achieved the record of 18 meters per day and 418 meters per month of roadway retention. At the same time, the employment of roadway retention reduced from 26 to 17 people, which was 35% lower than the traditional technology and 50% higher in the efficiency. That provided a new scheme for the safe and efficient mining without coal pillar in the mining area.