Abstract: According to production technology and filling method in an iron mine in Hebei,process reformation is conducted about backfilled retaining wall made by hollow brick.Bags filling slurry is instead of hollow bricks.The height of filling and the thickness of backfilled retaining wall are defined by mechanical analysis and thickness calculation.A complete quick masonry technique of backfilled retaining wall is formed.Practice shows that：the thickness of backfilled retaining wall with bags filling slurry 2.5m can meet the production requirements.Its drainage performance is better than that of the backfilled retaining wall with hollow brick,and its efficiency of filling and the strength of filling body are higher.

Key words: Filling retaining wall, Mechanical analysis, Thickness calculation