In Meishan iron mine. , some research works , such as railings dressing, building material production with railings, stack by solidification, and condensation dehydration, ect. ,have been done by small experiments and industrial experiments. By using the technique of weak magnetism - strong magnetism, the production of pure iron ore reaches seventy thousands tones. By using the technique of high - pressure condensation - flocculation sedimentation, the concentration of bottom flow is more than 45%, which conquers the difficulty of railings subsiding. By using the technique of pressure filtration, the problem of tailings dehydration is resolved. And tailings can be baked to high quality brick replacing clay.