Analytical model of electro osmotic dewatering was established based on its drainage characteristic and electrical parameters which influence concrete appearance such as the timestamp of on load voltage, voltage value, duration and the distance between electrodes. Furthermore, CPF (controlled permeable formwork) was also adopted to improve the surface quality of concrete. The test results show that electro osmotic dewatering combined with CPF technology could produce the high density concrete surface free of the voids and pits, which makes its permeability coefficient reduced and strength enhanced.