Abstract: In view of the quality problems with viscosity, sulphur and phosphorus contents, it is proposed in research work to coarsen grinding sizes and to adopt plate-and-frame press for classifying filtration, thus the problems with iron ore concentrate filtration are resolved preliminarily. Measures to increase concentrate proportion for sinter process applying the "quality adaptability "are discussed, achievements in research on overall reduction of viscosity and sulphur and phosphorus contents applying deep concentration method for flotation concentrates are also introduced.