Abstract: Ansteel Qidashan iron tailings with slag，natural gypsum and cement clinker are mixed，and produced cementitious materials.And then the cementitious materials are mixed with original tailing，and became high-strength concrete materials by adding water-reducing agent.The effects of water cement ratio on the strength of concrete is researched.And the microstructure of hydration products is analyzed by SEM.The experiments indicate that，with the water-bincler ratio increases，the fluidity of concrete is also increased，but the flexural strength and compressive strength have shown a gradual decreasing trend.With actual production needs，making with Qidashan iron tailings，the suitable concrete water cement ratio is 0.24.

Key words: Iron ore tailings, Concrete, Water-bincler ratio