The micro-arc oxidization is an efficient and pollution-free technique of surface processing and can form in situ a ceramic layer on the surface of nonferrous metal. In this paper, the micro-arc oxidization ceramic layer was formed on the surface of TiAl alloy by using a self-designing pulse power supply equipment of micro-arc oxidization. The oxidation dynamics of the ceramic layer on the surface of TiAl alloy was studied in the cycle high temperature condition and the experimental results show that the oxidation dynamics curve of TiAl alloy micro-arc oxidization ceramic layer submitted a parabolic function, which indicates that the ceramic layer can protect the TiAl alloy. Moreover, the effect of SiO3^2- on the characteristics of the ceramic layer was also studied, the results show that the working temperature with a micro-arc oxidization ceramic layer can be increased to 1273 K after adding SiO3^2- in the solution of the micro-arc oxidization. Analyzing by SEM and XRD test, the TiAl alloy ceramic layer contained 80 percent Al2TiO5, 11 percent TiO2 and 9 percent SiO2, which indicates that the addition of SiO2 can effectively restrain the decomposition of Al2TiO5 at high temperature and thus significantly increase the anti-oxidation of the TiAl alloy.