The yield stress of cement ground limestone pastes was tested by RHEOLAB QC viscometer, and the interparticle force was quantitatively analyzed by EDLVO theory, and the influence of interparticle forces on the yield stress of pastes was investigated. The results show that with the increase of separation distance, the Van Der Waals force between particles decreases at a quadratic rate while the electrostatic force and hydration force decrease at an exponential rate. The difference of total interparticle force is mainly determined by the separation distance. When D F fitting degree increases, the repulsive force in total interparticle forces first increases and then decreases, and the yield stress first decreases and then increases.