The growth process of MAO Coating made by the MAO power station designed by ourselves is studied in this paper. And the effect of the conductance and the current density on the growth process of MAO Coating is analyzed. We have got the MAO Coating which is over 250μm. The results show that increasing the conductance of MAO electrolyte can decrease the coating' s roughness and accelerate the growing speed of the coating. The relationship between the current density and the growing speed of coating is a linea...