The distribution characteristics of floc growth in cement-ground limestone pastes were described by multifractal theory. The relationship between characteristics and multifractal characteristics of floc growth was discussed. The results show that with the increase of the total specific surface area（SSA）， the number of small and large void increases， the distribution of floc becomes dispersed. Besides， the number of pony-size floc decreases， and the number of large size floc is stable， the size of floc decreases gradually. The floc growth is slowed down as a whole， but the opposite result appears with the continuous increase of SSA. The floc growth of pastes has a multifractal property. The spectral width， left spectral width and right spectral width of multifractal spectrum can characterize the spatial distribution， especially the spectral width. The spectral difference and left spectral value can describe the size distribution， especially the spectral difference.