In order to investigate the factors influencing the adsorption behavior of polymer particles on cement grains, the zeta potentials of fresh plain cement paste(PCP) and latex modified cement pastes(LMCP) were measured and the influences of latex type and the latex to cement ratio (mL/mC) on the adsorption behavior of polymer particles in the latex (for short as latex particles) on the cement grain were investigated. The results show that cement grains can adsorb latex particles, moreover, anionic latex particles are more easily adsorbed by cement grains than nonionic ones. With the increase of mL/mC the adsorbed latex particles on the cement grains increase to a constant level, therefore it can be concluded that the adsorption is single layered.