In order to study the coupling effect of water and ions in the process of solution transportation in cementitious materials, the self growth model was proposed first. Considering the influence of water cement ratio and hydration degree on porosity, a meso structure model of cement based porous media was established. Then, using the lattice Boltzmann method, the water transportation, ion diffusion, and solution transportation were simulated respectively, and the transformation and transportation of gas liquid two phase phenomena were simulated. The results show that the greater the porosity, the faster the transmission rate. In saturated porous media, ions diffuse along the pores in the water; while in dry porous media, the ion transmission rate dominated by solution is faster than that in saturated porous media due to the existence of convection. This work reveals the meso mechanism of the solution transfer process in cement based materials, and lays the foundation for a deep understanding of the actual occurrence of concrete durability.