Abstract: This paper set coal face 8102 in Wolonghu Coal mine as the research background and comprehensively analyzed its current economic status and geological conditions. We proposed backfilling technology for gob-side entry retaining using new cement concrete by analysis of movement characteristics of the overlying strata and theoretical calculation of the support resistance from the entry-side backfilling materials. Finally, parameters optimization of the backfilling technology is completed using numerical simulation. The in-situ monitoring of the surrounding rock stress proved the successful application of this technology in coal face 8102.