Abstract:  The influences of the particle size distribution （PSD） and the mineral composition distribution of cement prepared by different grinding technology on the physical performances of cement and concrete were investigated．The results show that there is a close relationship between PSD and grinding conditions as well as grinding system parameters．Narrower PSD can be obtained by using the high-efficiency separator with higher circulating-load and proper specific surface area．With narrower PSD and higher specific surface area‚most of C 3 S in clinker can efficiently enrich in particles smaller than30☞μm‚due to the good grindability and enrichment of C 3 S in cement particles．When the qualities of clinker and admixtures‚as well as the specific surface area of cement are kept stable‚narrower PSD （most particles are in the size range of0～30☞μm） results in higher water demand for normal consistency of cement paste‚longer setting time‚lower1-day compressive strength and higher3-and28-day compres-
sive strengths．The concrete prepared from this cement will be of great bleeding and low1-day compressive strength and high3-and28-day compressive strengths．

Key words: cement, concrete, particle size distribution, physical performance, grinding technology, mineral composition distribution